I believe the answer is D (However) because C (Therefore) would not make sense as it means ‘for that reason’ or ‘consequently’, B (Then) is a time connective so that would not make sense as a transition word to connect the paragraph, and A (now) could be referred to as informal depending on how you use it, and it is commonly used as an adverb of time.
I hope this helped
1) c) are
2) b) is
3) a) am
4) c) are
5) c) are
it wold be good to have an informational to share what you learned
Characters plot and conflict because it shows haw it gets to the climax