Step 1: Understanding the structure of a simple prism.
A prism is a transparent optical element with flat, polished surfaces that refract light. A triangular prism, which is the simplest type of prism, consists of:
1. Two triangular faces (base surfaces).
2. Three rectangular faces (lateral surfaces).
Step 2: Counting the total surfaces.
- The prism has two triangular faces (top and bottom).
- It also has three rectangular lateral faces.
\[
\text{Total surfaces} = 2 + 3 = 5
\]
Step 3: Conclusion.
Since a simple prism is bounded by 5 surfaces, the correct answer is (C) 5.