Problem: How does the sentence end?

Being a leader was a natural fit for Monica but not Natalie, since 
OPTIONS:
- Monica was quiet and shy.
- Natalie was quiet and shy.
Answer: Natalie was quiet and shy.

Problem: How does the sentence end?

Jeffrey told Aaron that he had a cold for the past week and drank nothing but orange juice to get rid of it.  
OPTIONS:
- Jeffrey was determined.
- Aaron was determined.
Answer: Jeffrey was determined.

Problem: How does the sentence end?

Felicia has nice white teeth but Rachel has yellowing teeth as 
OPTIONS:
- Felicia thinks oral care is overrated.
- Rachel thinks oral care is overrated.
Answer: Rachel thinks oral care is overrated.

Problem: How does the sentence end?

I think it's easier to be a student at private school rather than at public school as as the 
OPTIONS:
- private school has less people.
- public school has less people.
Answer:
private school has less people.