Why can chemotherapy be dangerous for women who are diagnosed with cancer early in a pregnancy?
A. Chemotherapy drugs promote cell division in an early embryo when the embryo should be slowly building its organ systems.
B. Chemotherapy drugs could target the fully formed organs of a fetus after the first trimester.
C. Chemotherapy drugs repress cell division in a fetus during the third trimester when the embryo should be rapidly building its organ systems.
D. Chemotherapy drugs could target the rapidly dividing cells that are building the organ systems in an early embryo, causing them to develop incorrectly or not at all.