I just took a test in school today. What question was I asked?

Question I was asked: Infectious diseases are caused by

I just took a test in school today. What question was I asked?

Question I was asked: What is one way that humans can maintain good health?

I just took a test in school today. What question was I asked?

Question I was asked:
A balloon filled with helium gas is set free and starts to move upward. Which of the following best explains why the helium balloon moves upward?