Answer:
c) Consumers with an inelastic demand
Explanation:
When the price increase, the demand for the product will decrease. The increase in price makes the customer look for a product substitute with cheaper price. Substitutes will keep the demand elastic since it can change easily.
But some customer has an inelastic demand, which means that their demand does not easily change when the price is increased. This type of customer can't substitute and have no choice but to keep buying even at a higher price.