Answer:
Option (b) is correct.
Step-by-step explanation:
The demand for a particular good is more inelastic if an increase in the price of a good doesn't or little effect on the demand for that good.
If there are fewer substitutes available for a particular good then an increase in the price of a particular good doesn't affect the demand for that good much because of the less alternatives available for the consumers.
Hence, they have to purchase this good even at a higher prices, so, the demand for that good doesn't or little change.
That's why the demand for those goods tends to be more inelastic.