I don't see the passage, but an antagonist is a villain, or in other words a negative role.
I believe the answer is 2) Keeps the audience interested even if your complex process is not as engaging as it could be hope this helps :)
"Don't forget to pack an extra lunch for your friend Mary."
The sentence that is best as it is is option B: Only Dave will go with us; the others are busy. The rest of the sentences contain incorrect parts such as the proper use of the word "only". In the first sentence, it should be "only to watch". In the third sentence, it should be "only drinks water". In the third sentence, it should be "Only Leah studied".