What Combination of X and Y Will Provide a Minimum

Multiple Choice

What combination of x and y will provide a minimum for this problem? Minimize Z = $3x + $15y; Subject to: (1) 2x + 4y > 12 (2) 5x + 2y > 10

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