#include <bits/stdc++.h>
#define ll long long
#define all(v)  v.begin(),v.end()
#define sz(x)  (int) (x).size()
#define el '\n'
#define Megz ios::sync_with_stdio(0);cin.tie(0);ios_base::sync_with_stdio(0);
using namespace std;
int mod = 1e9 + 7, N = 1e6+5;
int mul  (ll x , ll y ){
    x%=mod  ;
    y%=mod  ;
    return 1ll* (x*y)%mod;
}
int plu  (ll x , ll y ){
    x%=mod  ;
    y%=mod  ;
    return 1ll* (x+y)%mod;
}
struct vertex {
    ll anc ,  up  ,  down   ;
};
struct lca {
    vector<vector<vertex>>  yup_lifting ;
    vector<ll> depth   ;
    vector<ll> adj[400005] ;
    vector<ll> val  ;
    vector<ll> pow  ;
    const  int   LOG  =  19 ;
    void init (int n ){
        depth.assign(n+5, 0) ;
        val.assign(n+5,0) ;
        yup_lifting.assign(n+5,  vector<vertex>(LOG, {0,0,0})) ;
        pow.push_back(1) ;
        for (int i =0 ;  i<= (int) 1e7+5 ; i++){
            pow.push_back(mul(pow.back(),10)) ;
        }
    }
    void dfs (int node , int par ){
        yup_lifting[1][0] =  {par, val[1],  val[1]};
        for (auto child  :  adj[node]){
            if (child == par)continue;
            depth[child] =  depth[node]+1 ;
            yup_lifting[child][0] =  {node, val[child],  val[child]};
            for (int i =1 ; i < LOG ;i++){
                yup_lifting[child][i].anc =  yup_lifting[yup_lifting[child][i-1].anc][i-1].anc ;
                yup_lifting[child][i].up = plu(mul (yup_lifting[child][i-1].up , pow[(1<<i-1)]) , yup_lifting[yup_lifting[child][i-1].anc][i-1].up ) ;
                yup_lifting[child][i].down = plu(mul  (yup_lifting[yup_lifting[child][i-1].anc][i-1].down ,  pow[(1<<i-1)]) , yup_lifting[child][i-1].down)  ;
            }
            dfs(child, node) ;
        }
    }
    vertex go_up (int k  ,  int  node  ){
        vertex curr =  {node , 0,0} ;
        ll cnt = 0 ;
        for (int i =0 ; i < LOG  ; i++){
            if (k&(1<<i)){
                curr.up = plu(mul(curr.up , pow[(1<<i)]) , yup_lifting[curr.anc][i].up) ;
                curr.down = plu(mul  (yup_lifting[curr.anc][i].down , pow[cnt]) , curr.down)  ;
                cnt+=(1<<i) ;
                curr.anc = yup_lifting[curr.anc][i].anc ;
            }
        }
        return curr ;
    }
    int get_lca (int a ,  int b){
        if (depth[a]<depth[b])swap(a,b) ;
        int k =  depth[a]-depth[b] ;
        a  = go_up(k ,  a).anc ;
        if (a==b){
            return a  ;
        }
        for (int i = LOG -1  ; i>=0  ; i--){
            if (yup_lifting[a][i].anc!=yup_lifting[b][i].anc){
                a = yup_lifting[a][i].anc;
                b = yup_lifting[b][i].anc ;
            }
        }
        return yup_lifting[a][0].anc ;
    }
    int get_query (int from ,int to){
        int lca  = get_lca(from ,  to ) ;
        if (lca==from){
            vertex  ans  = go_up(depth[to]-depth[from]+1 ,  to) ;
            return ans.down ;
        }
        else if (lca==to){

            vertex  ans  = go_up(depth[from]-depth[to]+1 ,  from) ;
            return ans.up ;
        }
        else {
            int left  = go_up(depth[from]-depth[lca]+1 , from).up , right  = go_up((depth[to]-depth[lca]) , to).down ;
           // cout <<left <<" " <<right<<" "<<depth[lca]<<" " <<depth[to]<<" "  <<lca  <<el ;
            return plu(mul(left , pow[( depth[to]-depth[lca])] ),  right) ;
        }
    }


} lca;
void acc() {
    int n , q ;cin >>n>>mod >>q ;
    lca.init(n+5) ;
    for (int  i =0 ; i < n-1; i++){
        int x , y ;cin>>x>>y ;
        lca.adj[x].push_back(y) ;
        lca.adj[y].push_back(x) ;
    }

    for (int i =1 ; i<=n ; i++){
        cin >>lca.val[i] ;
        lca.val[i]%=mod ;
    }
    lca.dfs(1, 1) ;
    while (q--){
        int from ,  to ;cin >>from >>to ;
        cout <<lca.get_query(from  ,to)%mod<<el ;
    }
}

int main() {
    Megz
    int t = 1;
    while (t--) {
        acc();
    }

}


//5 100 4
//1 2
//1 3
//1 4
//5 3
//1
//2
//3
//0
//4
//1 5
//5 1
//4 2
//3 3
// ananananananana 5aaaaaawlwlwwllwlwl