Find the Second-Order Partial Derivative $\frac{\partial^{2} z}{\partial y^{2}}$ When $z=8 x e^{x y}$

Multiple Choice

Find the second-order partial derivative.
-Find $\frac{\partial^{2} z}{\partial y^{2}}$ when $z=8 x e^{x y}$ .

A) $8 x^{3} e^{x}$
B) $8 x^{3} e^{x y}$
C) $16 x^{2} e^{x y}$
D) $16 x^{2} e^{x}$