The Nurse Tells the Expectant Mothers During Their Last Prenatal

The nurse tells the expectant mothers during their last prenatal class that their fetus might receive a larger dose of a drug in the later period of their pregnancy. Which processes in the mother's body systems are responsible for this action?

A) Blood flow to placenta increases, and placental vascular membranes become thicker.
B) Blood flow to placenta decreases, and placental vascular membranes become thicker.
C) Blood flow to placenta increases, and placental vascular membranes become thinner.
D) Blood flow to placenta decreases, and placental vascular membranes become thinner.