When the Estimated Slope Coefficient in the Simple Regression Model $\hat { \beta } _ { 1 } ,$

Multiple Choice

When the estimated slope coefficient in the simple regression model,
$\hat { \beta } _ { 1 } ,$ is zero, then

A) $R ^ { 2 } = \bar { Y }$
B) $0 < R ^ { 2 } < 1$
C) $R ^ { 2 } = 0$
D) $R ^ { 2 } > ( S S R / T S S )$