Answer
Answer choice $C$: The product of $5$ and $(x - y)$ squared
Work Step by Step
Since $5$ is next to the parentheses containing $x-y$ in $5(x - y)^2$, it means to multiply $5$ and $(x-y)$.
$ 5 \times (x-y)^2$.
In English, this is written as
$5$ times $(x-y)$ squared.