10. Let plane $\alpha$ and $\beta$ be parallel, take 4 points in plane $\alpha$, and 5 points in plane $\beta$. The maximum number of planes that these points can determine is ( ).
A. 69
B. 70
C. 71
D. 72
10. D.  From $C_{5}^{1} C_{4}^{2}+C_{5}^{2} C_{4}^{1}+2=72$, we get,