PLEASE HELP FAST Which of the following is a step in simplifying the expression?

Answer:
A
Step-by-step explanation:
i am pretty sure its A because on the top one their is one negative and all of the other one are positive.
Answer:
None of them is right, the right answer is y^2/ x^10
Step-by-step explanation:
(xy^3/x^-4 y^4)^-2
= y^8/x^10 y^6
= y^2/ x^10