Geometric Probability question for GMAT

A point (x, y) is randomly picked from inside the rectangle with vertices (0, 0), (4, 0), (4, 1), and (0, 1). What is the probability that x ≤ y ?

(A) 1/8
(B) 1/4
(C) 3/8
(D) 1/2
(E) 3/4