Task: Question Answering
Input (English): If set S has the property that x is in S, and \(x^2 - 2x + 1\) is also in S, which of the following sets could be S?
(A)1,2,3 (B)0,1,2 (C)-1,0,1 (D)0,2 (E)1,2
Output (English): B