Geometry

Question Analysis:
This question examines understanding of how a pyramid's base shape determines its number of faces

Key Concept Explanation:
All pyramids have:
One polygonal base
Triangular lateral faces equal to the number of base sides
Thus, the simplest pyramid has the fewest base sides

Step-by-Step Solution:
Count minimum possible faces:
Triangular base → 3 lateral faces + 1 base = 4 faces
Square → 4 lateral + 1 base = 5 faces
Pentagon → 5 + ...