Final answer:
When the demand curve shifts to the right, the new equilibrium price and quantity will be higher.
Step-by-step explanation:
When the demand curve shifts to the right, the new equilibrium price and quantity will depend on the size of the shift. In general, a rightward shift in the demand curve will result in a higher equilibrium price and a higher equilibrium quantity. Therefore, the correct answer is D. The new equilibrium price would be higher and the new equilibrium quantity would be higher.