If $x_1$ and $x_2$ are roots of the equation $x^2+x+c=0\quad c\neq 0$ and $\large\frac{x_1^3}{2+x_2}+\frac{x_2^3}{2+x_1}=\frac{-1}{2}$ the value of -4c is

Question

$\begin{array}{1 1}(A)\;1&(B)\;3\\(C)\;5&(D)\;7\end{array}$