Problem: How does the sentence end?

Katrina became clingy and upset just before Betty had to leave, because 
OPTIONS:
- Katrina was their mother.
- Betty was their mother.
Answer: Betty was their mother.
sentence: Cynthia has a lot of relatives, but Maria has no family, so  OPTIONS:
- Cynthia goes to visit their friends on Christmas.
- Maria goes to visit their friends on Christmas.
complete: Maria goes to visit their friends on Christmas.
Felicia was able to grow beautiful multi-colored lilies in the backyard without a problem, but Sarah struggled to get anything to grow, because 
OPTIONS:
- Felicia had a greenthumb.
- Sarah had a greenthumb.
Felicia had a greenthumb.
Input: Continue writing.

Randy developed an allergic reaction to bleach in contrast to Kyle's indifference, so 
OPTIONS:
- Randy had to leave the room being cleaned.
- Kyle had to leave the room being cleaned.

Continued: Randy had to leave the room being cleaned.
Story needs to be completed:
William wanted Jeffrey to clean his pet snail's shell because 
OPTIONS:
- William knew nothing about snails.
- Jeffrey knew nothing about snails.

My choice:
William knew nothing about snails.
Problem: How does the sentence end?

The children enjoyed the cartoon more than they did the movie because the 
OPTIONS:
- cartoon was scary.
- movie was scary.
Answer:
movie was scary.