The answer is E because the square root 0f 36 is 6 and the square root of a^8 is a^4 and on the bottom the square root of 225 is 15 and a^2 is a
So not it looks like this:
6a^4 / 15a
The a's can simplify to
6/15 a^3 and the fraction can simply (by dividing by 3 ) to 3/5
So the final answer is 3/5(a^3)