Geometry

Question Analysis:
This conceptual question tests deep understanding of exterior angle properties across different polygon types.

Key Concept Explanation:
The sum of exterior angles is invariant (always 360°).
Other properties (like angle equality or type) depend on regularity and convexity.

Step-by-Step Solution:
Evaluate each option:
A) False (Can be obtuse in concave polygons)
B) False (Number varies by polygon)
C) True (Universal rule)
D) False (They're supplementary to interior angles)

Common Mistakes:
Overgeneralizing from regular polygon examples.