Problem: How does the sentence end?

Growing pine trees suited Brian but not Justin because 
OPTIONS:
- Brian had a lot of knowledge about growing trees.
- Justin had a lot of knowledge about growing trees.
Answer: Brian had a lot of knowledge about growing trees.

Problem: How does the sentence end?

The grout around the sink was coming off, so Jennifer asked Jessica how to regrout the sink. 
OPTIONS:
- Jennifer listened to the explanation carefully.
- Jessica listened to the explanation carefully.
Answer: Jennifer listened to the explanation carefully.

Problem: How does the sentence end?

Nelson always has tools for the right job unlike Jeffrey because 
OPTIONS:
- Nelson is always prepared.
- Jeffrey is always prepared.
Answer: Nelson is always prepared.

Problem: How does the sentence end?

Kayla would love to be a cinematographer, while Samantha wants to work in the sciences. 
OPTIONS:
- Kayla will work in movies.
- Samantha will work in movies.
Answer:
Kayla will work in movies.