How would you rewrite the expression 30a^3 + 40a^5 by factoring out the GCF?

A. 10a^3(3 + 4a^2)
B. 10a^2(3 + 4a^2)
C. 5a^3(6 + 8a^2)
D. 10a^3 (3a + 4a^2)

B. 10a^3(3 + 4a^2)