The quadratic eqn., whose one root is $2-\sqrt 3i$ is given by ?

Question

$\begin{array}{1 1}(A)x^2+4x-7=0 \\ (B) x^2-4x+7=0 \\ (C) x^2+4x+7 =0 \\(D) x^2-4x-7=0 \end{array}$