已知齐次线性方程组
( I ) $\left\{\begin{array}{c}x_1+2 x_2+3 x_3=0, \\ 2 x_1+3 x_2+5 x_3=0, \\ x_1+x_2+a x_3=0\end{array}\right.$
(ㅍ) $\left\{\begin{array}{c}x_1+b x_2+c x_3=0, \\ 2 x_1+b^2 x_2+(c+1) x_3=0\end{array}\right.$
同解，求 $a, b, c$ 的值.
$\text{A.}$
$\text{B.}$
$\text{C.}$
$\text{D.}$