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?

Pressure from the growing uterus displaces the stomach.

Retained bile in the liver results in delated digestion.

Increased estrogen production causes increased secretion of hydrochloric acid.

Increased progesterone production causes sphincter relaxation and decreased motility of smooth muscle.