$32 \cdot 58$ In an acute triangle $\triangle A B C$, the measures of the three interior angles are all prime numbers. Then such a triangle
(A) has only one, and it is an isosceles triangle.
(B) has at least two, and all are isosceles triangles.
(C) has only one, but it is not an isosceles triangle.
(D) has at least one, and among them, there are non-isosceles triangles.
(2nd China Tianjin "Chinese Youth Cup" Mathematics Invitational Competition, 1987)