Which of the following is not a reason why communicable diseases, such as pneumonia, kill fewer people today than they did in the past?
a.
continuing medical advances
b.
slower population growth
c.
improved living conditions
d.
better preventive treatment

The correct answer is B. slower population growth

Population growth is completely irrelevant if the medical advances are high enough to stop the disease. The population is growing constantly and yet you don't see the plague or leprosy almost anywhere because the living conditions and medical advances have been developed to a really high level