For what values of $k$ will the equation $(k+1)x^2-2(k-1)x+1=0$ have equal roots?

Question

$\begin{array}{1 1}(A) \; k=0,-3\\(B)\;k=0,-2 \\(C)\;k=0,3 \\(D)\;k=0,2 \end{array}$