Harold and Kumar Are Pre-Med and Pre-Pharmacy Students, Respectively

Harold and Kumar are pre-med and pre-pharmacy students, respectively. They complain to their biology professor that they should not have to study about plants because plants have little relevance to their chosen professions.
-From reading their biology textbook, what would Harold and Kumar discover?

A) About one-quarter of all prescription drugs come from seed plants.
B) Prescription drugs that enter the water table are responsible for the extinction of many plants.
C) Much of what was once rain forest has been replanted with fields of medicinally valuable plants.
D) All rain forest plants contain at least one chemical useful as a medicine.