The product of two consecutive positive integers is $306$.The quadratic equation to find the integers,if $x$ is the smallest integer is _____

Question

$\begin{array}{1 1}(A) \; x^2-x-306=0\\(B)\;x^2+x-306=0 \\(C)\;x^2+x+306=0 \\(D)\;x^2-x+306=0\end{array}$