During a Routine Prenatal Assessment, a Pregnant Woman Who Is

During a routine prenatal assessment, a pregnant woman who is 32 weeks pregnant complains that she is having more episodes of heartburn and problems with constipation. The nurse knows that these symptoms are related to:

A) Increased estrogen levels.
B) Increased progesterone levels.
C) Increased human chorionic gonadotropin levels.
D) All of the above.