Find the Value of the Linear Correlation Coefficient $r$ the Paired Data Below Consist of the Costs of the Paired

Multiple Choice

Find the value of the linear correlation coefficient $r$ . The paired data below consist of the costs of advertising (in thousands of dollars) and the number of products sold (in thousands) :
$\begin{array}{l|r|r|r|r|r|r|r|r}\text { Cost } & 9 & 2 & 3 & 4 & 2 & 5 & 9 & 10 \\\hline \text { Number } & 85 & 52 & 55 & 68 & 67 & 86 & 83 & 73\end{array}$

A) $- 0.071$
B) $0.708$
C) $0.235$
D) $0.246$