A. Complete Sentence
It has a subject and predicate and completes the thought.
The subject of a sentence is the person or a thing that is doing some action. So here, there is a person who is shivering at the thought of going back outdoors, and that person is Sean. So, the correct answer is Sean. The rest of the sentence is a verb phrase, or the predicate of the sentence.
Meteorologist
They literally studied weather forecasts so they would definitely play a role in it.
Answer:
I think it would be the first one but I'm not sure.