SAT Logic

Probability

X is a subset of Y and Y is a subset of Z. Which of the following statements must be true?

(A) $\ \$ If 1 is in Y, then 1 is in X.
(B) $\ \$ If 2 is in Z, then 2 is in X.
(C) $\ \$ If 3 is in Z, then 3 is in Y.
(D) $\ \$ If 4 is in X, then 4 is in Z.
(E) $\ \$ None of the above