Step 1: Analyse options.
- In four of the five figures, the relationship between the outer boundary and the inner symbol follows a specific rule (e.g., the inner symbol remains constant while the outer polygon's side count increases).
- Figure C deviates from this shared relationship, either by changing the inner symbol or failing to follow the outer shape's progression.
Step 2: Conclusion.
Figure C is the odd one out.
Final Answer: (c) C