Given $ n=10, \: \Sigma x = 3,\: \Sigma x^2=8,\: \Sigma y^2=9,\: \Sigma xy=3$ Find correlation coefficient

Question

$\begin {array} {1 1} (A)\;25 & \quad (B)\;.25 \\ (C)\;2.5 & \quad (D)\;0 \end {array}$