Final answer:
The correct answer is propagated. A propagated epidemic is one where the number of cases continues to rise as infected people continue to infect others.
Step-by-step explanation:
The correct answer is c) Propagated. A propagated epidemic is one where the number of cases continues to rise as infected people continue to infect others through direct or indirect person-to-person contact. In contrast to common-source spread, propagated spread does not have a single source of infection. Instead, each infected individual becomes a source for one or more subsequent infections, resulting in longer duration outbreaks. This type of spread is not easily stopped at a single source.