In the 1980s, with Health Care Costs Skyrocketing, a Deadly

In the 1980s, with health care costs skyrocketing, a deadly new disease threatened to take on epidemic proportions. In this disease,

A) a parasite was transmitted in polluted streams.
B) organic poisons were transmitted by the needles of drug users.
C) a virus broke down the human immune system.
D) leaking nuclear radiation caused incurable brain cancers.