2. Given the seven-digit number $\overline{13 a b 45 c}$ is divisible by 792. Then the value of $\frac{b}{a+c}$ is ( ).
(A) 0
(B) 1
(C) greater than 1
(D) greater than 0 and less than 1
2. A.

From $792=8 \times 9 \times 11$, we know that 45c can be divided by 8.
Thus, $c=6$.
Since $\overline{13 a b 45 c}$ can be divided by 9, therefore,
$a+b=17$ or 8;
Also, since $\overline{13 a b 45 c}$ can be divided by 11, therefore, $a-b=8$ or -3.
Given that $a, b$ are integers between $0 \sim 9$, we know $a=8, b=0$.