Problem: How does the sentence end?

Mary would care for Amy when they were kids since 
OPTIONS:
- Mary was the older one.
- Amy was the older one.
Answer: Mary was the older one.

Problem: How does the sentence end?

Emily dressed as Harry Potter for Halloween, but Cynthia went as a black cat, because 
OPTIONS:
- Emily was a super fan.
- Cynthia was a super fan.
Answer: Emily was a super fan.

Problem: How does the sentence end?

I was able to read more articles than stories because the 
OPTIONS:
- articles were shorter in length.
- stories were shorter in length.
Answer: articles were shorter in length.

Problem: How does the sentence end?

Kyle gained 20 pounds last year while Randy gained 2, because 
OPTIONS:
- Kyle ate lower calories food.
- Randy ate lower calories food.
Answer:
Randy ate lower calories food.