Problem: How does the sentence end?

Erin had roofing installed for Christine's apartment yesterday because 
OPTIONS:
- Erin was the tenant of the apartment.
- Christine was the tenant of the apartment.
Answer: Christine was the tenant of the apartment.
sentence: Derrick studied very hard in grad school but Hunter didn't, so  OPTIONS:
- Derrick passed their exams with top marks.
- Hunter passed their exams with top marks.
complete: Derrick passed their exams with top marks.
Monica longed to be as successful as Rachel , so 
OPTIONS:
- Monica asked her for career advice.
- Rachel asked her for career advice.
Monica asked her for career advice.
Input: Continue writing.

John needed more plaster to cover the wound on his skin because the 
OPTIONS:
- plaster is short.
- wound is short.

Continued: plaster is short.
Story needs to be completed:
Emily wants to grow turnips so she asks her friend Rachel for an advice, because 
OPTIONS:
- Emily needs help.
- Rachel needs help.

My choice:
Emily needs help.
Problem: How does the sentence end?

Benjamin is Matthew's economics tutor and helps him to get better, because 
OPTIONS:
- Benjamin need help.
- Matthew need help.
Answer:
Matthew need help.