Evaluate the Double Integral by First Identifying It as the Volume

Multiple Choice

Evaluate the double integral by first identifying it as the volume of a solid.
$$\iint _ { R } ( 15 - 2 x ) d A , R = \{ ( x , y ) \mid 2 \leq x \leq 5,3 \leq y \leq 8 \}$$

A) 300
B) $- 100$
C) 0
D) 200
E) 100