Simplify. 7/2a*5/a^2

A. 35/2a^2 where a ≠ 0
B. 35/2a^2
C. 12/2a^3 where a ≠ 0
D. 35/2a^3 where a ≠ 0

D. 35/2a^3 where a ≠ 0