Answer: A, C, E
Explanation:
Ignore the square root for now. 75/15 can be simplified into 25/5 (by dividing both by 3).
25/5 can be simplified into 5 (by dividing both by 5). 75/15 can also be simplified into 15/3 (by dividing both sides by 5). Now put the square roots back onto the simplified answers.