Given that $xy > 0$, which of the following must also be greater than zero?

Source: Magoosh

Given that $xy > 0$, which of the following must also be greater than zero?

A. $x+y$

B. $x^2+y$

C. $(x+y)^2$

D. $x^2-y^2+100$

E. $(x-y)^2$

The OA is C

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