How Did the Studies of the Ancient Greek Physicians Influence

How did the studies of the ancient Greek physicians influence the progress of medicine during the period of history known as the Dark Ages?

A) They encouraged the founding of research centers and scientific experiments.
B) They discouraged further study, because Hippocrates and Galen were considered the final authorities on matters of medicine.
C) They had no real effect, because the early Christians ignored their writings.
D) They encouraged the founding of hospitals and the humane treatment of patients.