Answer:
A, B, and C
Step-by-step explanation:
A) Antibiotic resistance; the entire second paragraph's focus is on antibiotic resistance as it discusses the issue and how the CDC is addressing it.
B) Flu prevention; the fourth paragraph talks about the flu and three ways to prevent it: "First, get a flu vaccine. Second, take everyday preventive actions, such as washing your hands and covering your nose and mouth with your arm when you sneeze. Third, take any antiviral drugs your doctor may prescribe"
C) The need for vaccinations; the third paragraph mainly discusses this subject, insisting on the benefits of community vaccinations.
None of the other choices (need for safe, clean water; threats from disease in other countries; and the effects of pollution on asthma rates) are mentioned, so eliminate them.
Hope this helps!