Answer
The answer to this question is C
Work Step by Step
To show why answer C is cororect we can use the process of elimination.
Answer A is wrong because the product would like 5(x-$y^{2}$)
Answer B is incorrect because the product would be 5($x^{2}$-$y^{2}$)
Answer D is incorrect because the product would be $\frac{5}{(x-y)^{2}}$
Since none of these look like 5$(x-y)^{2}$, we can infer that answer to the problem is C.