$\frac{7863}{13}=604+\frac{\square}{13}$. The number represented by $\square$ is
(A) 11
(B) 8
(C) 9
(D) 3
(E) 10
Rewriting the right side with a common denominator,

$\frac{7863}{13}=\frac{604 \times 13+\square}{13}=\frac{7852+\square}{13}$

Therefore, $\square=11$.

Answer: (A)