2021 Fermat Problem 12

How many of the 20 perfect squares 1^2, 2^2, 3^2, \ldots, 19^2, 20^2 are divisible by 9?

\textbf{(A)}\ 2\quad \textbf{(B)}\ 3\quad \textbf{(C)}\ 4\quad \textbf{(D)}\ 5\quad \textbf{(E)}\ 6

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.