Option (D) will be correct answer.
You need to sort all the $n^{2}$ numbers to get median of medians.
Those who have doubt, please find median of median of following 5X5 matrix in O($n^{2}$) complexity
$\begin{bmatrix} 13& 11& 6& 21& 1\\ 14& 7& 12& 2& 22\\ 23& 16& 8& 18& 3\\ 9& 19& 24& 17& 4 \\ 10& 20& 15& 25& 5 \end{bmatrix}$
If you first find the median of all the rows, and then find median of all the medians, you will get answer as 16.
But the correct answer is 13.