Which Following Factor Initially Led to the Development of Medical

Which following factor initially led to the development of medical sociology?

A) The epidemiological transition i.e., changes in disease patterns in the population) .
B) The fact that medical schools made the study of social sciences mandatory during the first half of the 20th century.
C) Increasing awareness by physicians of the importance of social inequality in the etiology of illness and disease.
D) The discovery of miracle cures for diseases such as leprosy that could not be attributed to medical science.