2. The 12 medians of the 4 equilateral triangular faces of a regular tetrahedron can form \( n \) different acute angles, then the value of \( n \) is ( ).
(A) 4
(B) 5
(C) 6
(D) 7
2. B.

The cosine values of the angles formed by the medians on the surface of a regular tetrahedron's equilateral triangles are $\frac{1}{6}$, $\frac{1}{3}$, $\frac{5}{6}$, $\frac{2}{3}$, and $\frac{1}{2}$.