Multiply, Then Simplify the Product $(4 \sqrt{x}+\sqrt{y})(4 \sqrt{x}-\sqrt{y})$ A) $16 x-y$ B) $16 x^{2}-y^{2}$

Multiple Choice

Multiply, then simplify the product. Assume that all variables represent positive real numbers.
- $(4 \sqrt{x}+\sqrt{y}) (4 \sqrt{x}-\sqrt{y})$

A) $16 x-y$
B) $16 x^{2}-y^{2}$
C) $16 x-2 \sqrt{x y}-y$
D) $16 x+y$