3. There are four points on a plane, and no three points are collinear. Connecting these four points with six line segments, the minimum number of triangles that can be formed in the resulting figure is ( ).
(A) 3
(B) 4
(C) 6
(D) 8
Analysis: In a triangle with three vertices, there is a point inside, which is connected to the three vertices of the triangle, forming 3 line segments, resulting in a total of 4 triangles, which is the minimum.

 untranslated part:
此时最少。

translated part:
at this point, it is the minimum.