/// Author : Shohanur Rahaman
/// URI : 1547

#include<stdio.h>

int main()
{
    int tc,n,sn,i,j,tmp,ck;
    int num[10]={0};

            scanf("%d",&tc);

            while(tc--){
                scanf("%d %d",&n,&sn);
                ck=0;
                tmp=0;

                    for(i=0;i<n;i++){
                        scanf("%d",&tmp);

                        if(sn>tmp){
                            num[i] = sn-tmp;
                        }
                        else{
                        num[i] = tmp-sn;
                        }
                    }

tmp= num[0];

                    for(j=0;j<n;j++){

                            if(num[j]==0){
                                ck=j;
                                break;
                            }
                              else if( tmp > num[j] ){
                                    tmp=num[j];
                                    ck=j;
                                }
                    }

                   printf("%d\n",ck+1);

            } // end while

    return 0;
}