Determine What Signs on Values of X and Y Would $x y < 0$

Multiple Choice

Determine what signs on values of x and y would make the statement true. Assume that x and y are not 0.
- $x y < 0$

A) $x$ and $y$ must be negative.
B) $x$ and $y$ must be positive.
C) $x$ and $y$ have different signs.
D) $x$ and $y$ have the same sign.