Find the Value(s) of the Function, Subject to the System $Z=9 x-18 y$

Multiple Choice

Find the value(s) of the function, subject to the system of inequalities.
-Find the maximum and minimum of $Z=9 x-18 y$ subject to:
$0 \leq x \leq 5,0 \leq y \leq 8,4 x+5 y \leq 30$ , and $4 x+3 y \leq 20$ .

A) 45,0
B) $-78.75,-108$
C) $-108,0$
D) $45,-108$