The table to the right displays the grade distribution of the 30 students in a mathematics class on the last two tests. For example, exactly one student received a ‘D’ on Test 1 and a ‘C’ on Test 2 (see circled entry). What percent of the students received
\begin{array}{|c|c|c|c|c|c|}
\hline
S & & B & C & D & F \\
\hline
A & 2 & 2 & 1 & 0 & 0 \\
\hline
B & 1 & 4 & 3 & 0 & 0 \\
\hline
C & 1 & 3 & 5 & 2 & 0 \\
\hline
D & 0 & 0 & (1) & 1 & 1 \\
\hline
F & 0 & 0 & 2 & \mathbf{1} & 0 \\
\hline
\end{array}
the same grade on both tests?
Answer Choices
A. 12 \%
B. 25 \%
C. 33 \dfrac{1}{3} \%
D. 40 \%
E. 50 \%