3. Let $\alpha, \beta$ be two non-coincident planes, take 5 points in plane $a$, and 7 points in plane $\beta$. These points can determine at most () planes.
A. 175
B. 177
C. 196
D. 198
3. B
$$
7 \times\binom{ 5}{2}+5 \times\binom{ 7}{2}+2=177
$$