Answer:
A. Warned
Explanation: When you give a warning it means that something very dangerous could happen.
The sentence in which the underlined infinitive phrase functions as a subject is the last one - to quickly move large groups of people is the purpose of public transportation.
<em>To quickly move </em>is the infinitive phrase, and it is a subject.
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Answer:
I believe he means that in the Caribbean people died so young that he imagines it so often. He thinks he needs to make any happy/good moment last so he remembers that.
Explanation: