The Equation of the Regression Line for the Paired Data $\hat { y } = 3 x$

Multiple Choice

The equation of the regression line for the paired data below is $\hat { y } = 3 x$ . Find the explained variation.
$\begin{array}{l|rrrr}\mathrm{x} & 2 & 4 & 5 & 6 \\\hline \mathrm{y} & 7 & 11 & 13 & 20\end{array}$

A) $88.75$
B) $10.00$
C) $72.45$
D) $78.75$