Can someone please help me I really need help

A.

Explanation:

Criticizing would be the downfalls of the edible vaccines. That means A is the only good thing there. Therefore, A is not criticism of edible vaccines.

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.