The set of all values of 'a' for which the roots of the equation $(1+a)x^2-3ax+4a=0$ exceeds 1

Question

$\begin{array}{1 1}(A)\;(-1,2)&(B)\;(-\Large\frac{16}{7},\normalsize -1)\\(C)\;(-1,3)&(D)\;(-\Large\frac{16}{7},\normalsize 0)\end{array}$