A nurse is instructing a pregnant patient concerning the potential risk to her fetus from a Pregnancy Category B drug. The nurse would inform the patient that:

a) Pregnancy Category B drugs are those for which animal studies have not shown harm to the fetus, but there are no well-controlled studies in pregnant women. This means that while the drug appears to be safe in animal models, its effects on human pregnancy remain uncertain. b) This statement describes Pregnancy Category A, where adequate human studies have shown no risk to the fetus. c) This statement describes Pregnancy Category D, where there is clear evidence of human fetal risk, but benefits may outweigh risks in certain situations. d) This statement describes Pregnancy Category C, where animal studies have shown adverse effects, but there are no adequate human studies, and the drug may still be used if the benefits outweigh the risks.