#include<bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define endl '\n'
using ll = long long;
using ull = unsigned long long;
using PII = pair<int, int>;
using PLL = pair<ll, ll>;
const int N = 1e6 + 10;
const int M = 131;
const int INF = 0x3f3f3f3f;
const long long LNF = 0x3f3f3f3f3f3f3f3f;
const long long mod = 1e9 + 7;

void solve(){
	int n, m, q; cin >> n >> m >> q;
	vector<int> bac(n + 1);
	for(int i = 1; i <= m; i++){
		int x; cin >> x;
		bac[x] = 1;
	}
	vector<vector<pair<int, ll>>> g(n + 1);
	for(int i = 1; i < n; i++){
		int a, b, c; cin >> a >> b >> c;
		g[a].push_back({b, c});
		g[b].push_back({a, c});
	}
	int idx = 0;
	vector<vector<int>> father(18, vector<int>(n + 1));
	vector<ll> val(n + 1), dfn(n + 1), deep(n + 1), dis(n + 1);
	function <void(int, int, ll)> dfs = [&] (int u, int fa, ll v){
		val[u] = v;
		dfn[u] = ++idx;
		father[0][u] = fa;
		deep[u] = deep[fa] + 1;
		for(int i = 1; i <= 17; i++) father[i][u] = father[i - 1][father[i - 1][u]];
		for(auto [a, b] : g[u]){
			if(a == fa) continue;
			dis[a] = dis[u] + b;
			dfs(a, u, (bac[a] ? a : v));
		}
	};
	dfs(1, 0, 1);
	function<int(int, int)> LCA = [&] (int a, int b){
		if(deep[a] < deep[b]) swap(a, b);
		for(int i = 17; i >= 0; i--){
			if(deep[father[i][a]] >= deep[b]) a = father[i][a];
		}
		if(a == b) return a;
		for(int i = 17; i >= 0; i--){
			if(father[i][a] != father[i][b]){
				a = father[i][a]; b = father[i][b];
			}
		}
		return father[0][a];
	};
	//for(int i = 1; i <= n; i++) cout << "dfn " << i << ' ' << dfn[i] << '\n';
	while(q--){
		int k; cin >> k;
		vector<int> s(k + 1);
		ll l = 0, r = 0;
		for(int i = 1; i <= k; i++){
			cin >> s[i];
			r = max(r, dis[s[i]] - dis[val[s[i]]]);
		}
		sort(s.begin() + 1, s.end(), [&](int a, int b){
			return (dis[a] - dis[val[a]]) > (dis[b] - dis[val[b]]);
			});
		function <bool(ll)> check = [&] (ll mid){
			ll mn = idx, mx = 0;
			for(int i = 1; i <= k; i++){
				//cout << "vertex " << s[i] << ' ' << val[s[i]] << ' ' << dis[s[i]] << ' ' << dis[val[s[i]]] << '\n';
				if(dis[s[i]] - dis[val[s[i]]] > mid){
					mn = min(mn, dfn[s[i]]);
					mx = max(mx, dfn[s[i]]);
				}
			}
			int lca = LCA(mn, mx);
			//cout << mn << ' ' << mx << ' ' << lca << ' ' << mid << '\n';
			for(int i = 1; i <= k; i++){
				if(dis[s[i]] - dis[val[s[i]]] > mid){
					if(dis[s[i]] - dis[lca] > mid) return false;
				}
			}
			return true;
		};
		while(l < r){
			ll mid = (l + r) >> 1;
			if(check(mid)) r = mid;
			else l = mid + 1;
		}
		cout << l << '\n';
	}
}

int main(){
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout << fixed << setprecision(12);
	int t = 1;
	cin >> t;
	while(t--){
		solve();
	}
	return 0 - 0;
}