2. Among all the interior angles of a convex decagon, the maximum number of acute angles is ( ).
(A) 0
(B) 1
(C) 3
(D) 5
2. (C).

Since the sum of the exterior angles of any convex polygon is $360^{\circ}$, the number of obtuse exterior angles is at most 3, which means the number of acute interior angles is at most 3.