A nurse in a prenatal clinic is caring for a client who is at 12 weeks gestation. The client asks about the cause of her heartburn. Which of the following responses should the nurse make?

Increased progesterone production causes decreased motility of smooth muscle.

Pressure from the growing uterus displaces the stomach.

Increased estrogen production causes increased secretion of hydrochloric acid.

Retained bile in the liver results in delayed digestion.