Solve this following

If $A=\left(\begin{array}{ll}3 & 1 \\ 7 & 5\end{array}\right)$ and $A^{2}+x \mid=y A$ then the values of $x$ and $y$ are

A. $X=6, y=6$

B. $X=8, y=8$

C. $x=5, y=8$

D. $x=6, y=8$