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.
$$\iint _ { R } ( 15 - 2 x ) d A , R = \{ ( x , y ) \mid 3 \leq x \leq 7,3 \leq y \leq 5 \}$$

A) 40
B) $- 160$
C) $- 60$
D) 140
E) 240