3. (2005 Henan Province Competition Question) Let the sequence $\left\{a_{n}\right\}$ satisfy $a_{1}=3, a_{n+1}=a_{n}^{2}-(3 n-1) a_{n}+3$, then the sum of the first 11 terms of the sequence $\left\{a_{n}\right\}$, $S_{11}=$
A. 198
B. 55
C. 204
D. 188
3. Choose A.

Slightly explained: Substituting $a_{1}=3$ yields $a_{2}=6$, substituting $a_{n}=3 n$ yields $a_{n+1}=3(n+1)$.