<p>Rectangle ABCD lies in the xy-coordinate plane so that its sides are not parallel to the aces. What is the product of the slopes of all four sides of rectangle ABCD?</p>

<p>A. -2

B. -1

C. 0

D. 1

E 2</p>

<p>I got +4 as an answer. Please explain. I understand how 2 sides of the rectangle are ll and thus have the same slope, but when I multiply the 4 slopes I don't get any of those answer choices.</p>