Minimize $c = 3 x - 3 y$ Subject To A) $c = 3$

Multiple Choice

Minimize $c = 3 x - 3 y$ subject to $$\begin{aligned}\frac { x } { 6 } & \leq y \\y & \leq \frac { 2 x } { 3 } \\x + y & \geq 5 \\x + 3 y & \leq 20 \\x \geq 0 , y & \geq 0\end{aligned}$$

A) $c = 3$ , $x = 2$ , $y = 3$
B) $c = 6$ , $x = 2$ , $y = 3$
C) $c = 3$ , $x = 3$ , $y = 2$
D) the feasible region is empty
E) the objective function is unbounded