Geometry

Question Analysis:
This question requires distinguishing a prism from a pyramid based on face configuration.
The main focus is recognizing the defining structural difference: number of bases and lateral face type.

Key Concept Explanation:
A prism has:
Two congruent polygonal bases
Lateral faces are rectangles or parallelograms
A pyramid has:
One base
Lateral faces are triangles meeting at a point (apex)

Step-by-Step Solution:
Only one base → immediately not a prism
Triangular sides meeting at a point → this is a square pyramid

Common M...