What Combination of X and Y Will Yield the Optimum

Multiple Choice

What combination of x and y will yield the optimum for this problem? Maximize Z=$3x+$15y
Subject to:
2x+4y ≤ 12
5x+2y ≤ 10

A) x = 2, y = 0
B) x = 0, y = 0
C) x = 0, y = 3
D) x = 1, y = 2.5
E) x = 0, y = 4