Answer:
D. Equilateral triangle
Step-by-step explanation:
Every face is a regular polygon of the same size and shape. Example: each face of the cube is a square.
So, out of the given options, equilateral triangles is the answer.
Each vertex of a regular triangle is 60°. And there can be 3, 4, or 5 triangles meeting at a vertex but all will be equilateral triangles. For example: a tetrahedron.
