It is most likely B. An intransitive verb doesn't have an object, the action verb(cheered) is in front as well.
Doctors warned people to stay away from the medical tent where patients were being treated in order to avoid contagion. This means to avoid the spread or transfer of diseases or infection. Contagion means the communication of illnesses from one person to another, most especially when in close contact.
Answer:
A
Explanation:
Ive read the book and A makes alot more sense Hope this helps! :D