Geometry

Question Analysis:
This question tests basic knowledge of a fixed property of polygons.
The main focus is on the exterior angle sum theorem.

Key Concept Explanation:
No matter how many sides a convex polygon has, the sum of its exterior angles (one per vertex) is always 360°.

Step-by-Step Solution:
The exterior angles "turn" around the polygon.
After completing one loop, you've turned a full circle: 360°

Option Analysis:
A. 180° – Often confused with triangle angle sum
B. ✅ Correct – Always 360°