It Is Known That R_XY = 0 $\bar{X}$ And $\bar{Y}$

Multiple Choice

It is known that r_XY = 0.5, s_X² = 1, s_Y² = 1. A simple linear regression model is estimated. The regression line will have a slope of which one of the following?

A) 0
B) 0.5
C) 0.5 or -0.5
D) 1 or -1
E) It depends on the values of $\bar{X}$ and $\bar{Y}$ .