Problem: How does the sentence end?

Since Cynthia was a morning person while Lindsey was a night person, 
OPTIONS:
- Cynthia tended to wake up very early on weekends.
- Lindsey tended to wake up very early on weekends.
Answer: Cynthia tended to wake up very early on weekends.

Problem: How does the sentence end?

The project Nick chose made Kevin nervous, so 
OPTIONS:
- Nick showed him the outline of the plan.
- Kevin showed him the outline of the plan.
Answer: Nick showed him the outline of the plan.

Problem: How does the sentence end?

Mary had a very large compact disc collection but Maria had all albums, because 
OPTIONS:
- Mary was older.
- Maria was older.
Answer: Maria was older.

Problem: How does the sentence end?

Cynthia got a much better score on their math test than Rebecca. 
OPTIONS:
- Cynthia took the time to study for it.
- Rebecca took the time to study for it.
Answer:
Cynthia took the time to study for it.