Final answer:
c. Both the new equilibrium price and quantity will increase.
If the demand curve increases and the supply curve remains constant, both the new equilibrium price and quantity will increase.
Step-by-step explanation:
When the demand curve increases, while the supply curve remains constant, this is represented on a graph as a rightward shift of the demand curve. Since the supply curve does not move, the new equilibrium point will be at a higher quantity and price than before. Therefore, the result of an increase in demand while supply remains constant will be both a higher equilibrium price and a higher equilibrium quantity.