Concept:
Polymers are classified as:
• Natural: Obtained from nature (e.g., silk)
• Synthetic: Fully man-made (e.g., terylene, neoprene)
• Semisynthetic: Chemically modified natural polymers
Step 1: Identify each polymer.
• Silk: Natural
• Terylene: Synthetic polyester
• Viscose rayon: Modified cellulose (semisynthetic)
• Neoprene: Synthetic rubber
Step 2: Conclusion.
Thus, viscose rayon is semisynthetic.
Final Answer: Option (C)