Which of the following shapes is described as having one triangular base and three lateral faces?

There is only one three dimensional shape that would be made with these lateral faces and a triangular base.  It would be a triangular pyramid.  The name of the pyramid is determined by the shape of the base (triangle), and the 3 sides on the triangular base would create 3 lateral faces on the pyramid when they meet at a single point.

Idon't know and i'm a teacher