What Combination of X and Y Will Provide a Minimum $Z = \$ 3 x + \$ 15 y$

Multiple Choice

What combination of x and y will provide a minimum for this problem? Minimize $Z = \$ 3 x + \$ 15 y$
$\begin{array} { l } \text{Subject to:}&2 x + 4 y \geq 12 \\&5 x + 2 y \geq 10\end{array}$

A) x = 0, y = 0
B) x = 0, y = 3
C) x = 0, y = 5
D) x = 1, y = 2.5
E) x = 6, y = 0