A Mahalanobis distance that matches none of the printed options

The Mahalanobis distance between the two Bivariate Normal populations $N_2\!\left(\left(\begin{smallmatrix}-2\\3\end{smallmatrix}\right), \left(\begin{smallmatrix}2&2\\2&4\end{smallmatrix}\right)\right)$ and $N_2\!\left(\left(\begin{smallmatrix}1\\2\end{smallmatrix}\right), \left(\begin{smallmatrix}2&2\\2&4\end{smallmatrix}\right)\right)$ is: