I think the correct answer would be “look at it”
The 1900’s
With the turn of the century came a push for organized medicine, led in part by the American Medical Association (AMA), which was growing stronger and gained 62,000 physicians during the coming decade. But because the working class wasn’t supportive of the idea of compulsory healthcare, the U.S. didn’t see the kind of groundswell that leading European nations would see soon after.
Either seek new friends or suggest an alternative
Cardiovascular system has to do with the heart, so anything to reduce the risk of that system (including the heart, bloodstream etc.) would be the answer for you. So just using Process of elimination:
A) Has to do with external exposure. <em>No</em><em />
B) Keeping hands clean <em>No</em><em />
C) Avoiding cigarette smoke <em>Yes</em>
D) Keeping your vaccinations up to date <em>No</em><em />
So your answer is C.
