Step 1: Definition
- Extensive property: Depends on the amount of matter.
- Intensive property: Independent of the amount of matter.
Step 2: Analysis
- Volume, Enthalpy, and Entropy increase as the amount of substance increases (Extensive).
- Molar volume is volume per mole; it is a fixed ratio and does not change with the total amount (Intensive).
Step 3: Conclusion
Molar volume is an intensive property.
Final Answer: (D)