What Combination of X and Y Will Yield the Optimum $Z=\$ 3 x+\$ 15 y$

Multiple Choice

What combination of x and y will yield the optimum for this problem? Maximize $Z=\$ 3 x+\$ 15 y$

$\begin{array}{l}\text{Subject to:}&2 x+4 y \leq 12 \\&5 x+2 y \leq 10\end{array}$

A) x = 2, y = 0
B) x = 0, y = 0
C) x = 0, y = 3
D) x = 1, y = 5
E) x = 0, y = 4