Find the Explained Variation for the Paired Data $\hat { y } = 44.8447 + 3.52427 x$

Multiple Choice

Find the explained variation for the paired data.
-The paired data below consists of test scores and hours of preparation for 5 randomly selected students. The equation of the regression line is $\hat { y } = 44.8447 + 3.52427 x$ . Find the explained variation.
$\begin{array}{c|rrrrr}x \text { Hours of preparation } & 5 & 2 & 9 & 6 & 10 \\\hline y \text { Test of score } & 64 & 48 & 72 & 73 & 80\end{array}$

A) $498.103$
B) $511.724$
C) $599.2$
D) $87.4757$