3. (8 points) During the Spring Festival, Mom bought 3 identical lucky bags. Xiao Yue wants to put 10 identical one-yuan coins into these three lucky bags. If each bag must contain at least 1 coin, and the order of the bags does not matter, there are ( ) ways to do this.
A. 6
B. 7
C. 8
D. 9
【Answer】Solution: By enumeration, 10 can be decomposed into the sum of which three numbers, $10=1+1+8=1+2+7=1+3+6+1+4+5=$ $2+2+6=2+3+5=2+4+4=3+3+4$, a total of 8 ways.

Therefore, the answer is: $C$.