The area of the triangle whose vertices are $A(2,7),B(3,-1)$ and $ (-5,6)$ are

Question

$\begin{array}{1 1}(A) \;27.5\;sq.units \\(B)\;28.5\;sq.units \\(C)\;26.5\;sq.units \\(D)\;29.5\;sq.units \end{array}$