Choose the correct answer below.

$A.\frac{A}{x-7}+\frac{B}{(x-7{)}^2}+\frac{Cx+D}{x^2+3}$

$B.\frac{A}{x-7}+\frac{B}{(x-7{)}^2}+\frac{C}{x^2+3}$

$c.\frac{A}{(x-7{)}^2}+\frac{Bx+C}{x^2+3}$

$D.\frac{Ax+B}{(x-7{)}^2}+\frac{Cx+D}{x^2+3}$