Find the general solution of the differential equation $(x+y)\large\frac{dy}{dx}$$=1$

Question

$\begin{array}{1 1}(A)\;x-y-1 = Ce^{-y} \\ (B)\;x+y+1 = Ce^{-2y} \\ (C)\;x+y-1 = Ce^{-y} \\(D)\;x+y+1 = Ce^{-y} \end{array}$