Respuesta :
The correct answer is A. This is because they are asking if the flu shot is necessary and effective to work to prevent the flu. We automatically know B is not the answer because the question is very unnecessary and does not sound like it could be a scientific question. C can’t be it because it’s talking about if the shot is beneficial because of the cost. It also can’t be D because it definitely does not make sense for there not to be a vaccine available for the people who need it for the flu. In this case the best option would be A.
