Answer:
D is your answer
Explanation:
What you do to figure this out is you take the 3^15 and make it to where there is 15 3's.
3, 3, 3, 3, 3, 3, 3, 3, 3 ,3, 3, 3 ,3, 3, 3.
You will then put them in groups of 2 to get them out of the Square root.
3,3 3,3 3,3 3,3 3,3 3,3 3,3 3.
There are 7 groups where the 3 can come out of the Square root.
So your answer is 3^7sqrt3. D is your answer.