Given the Least Squares Regression Line $\hat{y}$ = -288 + 1

Multiple Choice

Given the least squares regression line $\hat{y}$ = -2.88 + 1.77x,and a coefficient of determination of 0.81,the coefficient of correlation is:

A) -0.88.
B) +0.88.
C) +0.90.
D) -0.90.