Pretty confident that it is A, judging by that the word composition is used as a combination or a ratio of 2 things. Also none of the other options make sense.
Answer: Asking a doctor questions when something doesn't feel right
Explanation: Sharing your concerns with a medical professional is the most important part of being proactive. Even if your concerns are only suspicions at the time the doctor will use best diagnostics to exclude or identify a problem.
Delaying sharing such concerns may potentially mean loss of valuable time in a treatment. Self-diagnosis is prone to error and online source may be biased/misleading.
Extra flossing may be good, but won't replace dental checkups.
Using home remedies is more often than not unreliable and, while are certainly free to use them, does not represent the idea of being proactive with your health.
Salmonella - A. food inspection
Whooping Cough - C. vaccination
HIV - B. education
Plaque or the build up of fatty deposits is the answer to the question
