const A = [0, 1, 2],
  B = [2, 1, 0],
  C=[2, 1];

// A.every( e => B.includes(e) )

console.log(A.every(e => B.includes(e)));
console.log(A.every(e => C.includes(e)));
console.log(C.every(e => B.includes(e)));