2015 Fermat Problem 1

The average (mean) of the five numbers 8, 9, 10, 11, 12 is

\textbf{(A)}\ 12.5\quad \textbf{(B)}\ 8\quad \textbf{(C)}\ 9.6\quad \textbf{(D)}\ 9\quad \textbf{(E)}\ 10

If there are no answer choices shown, enter a numerical answer.

Full credit to this problem is given to the CEMC, you may view all Fermat contests here.