Problem: How does the sentence end?

In the chess game, the rook piece took the opponent's knight piece since the 
OPTIONS:
- rook piece was at a disadvantage.
- knight piece was at a disadvantage.
Answer: knight piece was at a disadvantage.

Problem: How does the sentence end?

Angela attended a private school, while Emily attended a public school, because 
OPTIONS:
- Angela had middle class parents.
- Emily had middle class parents.
Answer: Emily had middle class parents.

Problem: How does the sentence end?

Chet and his friends went to the diner instead of the bar because there was more space at the 
OPTIONS:
- bar .
- diner .
Answer: diner .

Problem: How does the sentence end?

Carrie kept a journal for 10 years but then stopped while Samantha kepti at it for 20 years, because 
OPTIONS:
- Carrie got too busy.
- Samantha got too busy.
Answer:
Carrie got too busy.