[Q]: How does the sentence end?

Juan wanted to replace his car with a brand new motorcycle. Because the 
OPTIONS:
- motorcycle was old.
- car was old.

[A]: car was old.
QUES: Continue writing.

William helped the stranger lift the box instead of Jason because 

OPTIONS:
- William is a lot stronger than weaker.
- Jason is a lot stronger than weaker.
+++++++++
ANS: William is a lot stronger than weaker.
Problem: How does the sentence end?

Joshua was going to skip the concert because he had homework; luckily, the 
OPTIONS:
- homework was repeated so he could go.
- concert was repeated so he could go.
Answer: concert was repeated so he could go.
sentence: The cage offered less shelter than the barn because the  OPTIONS:
- barn had a tarp roof.
- cage had a tarp roof.
complete: cage had a tarp roof.
After admission to the group, Ben was given a uniform and not the cape yet because the 
OPTIONS:
- uniform was required.
- cape was required.
uniform was required.
Problem: Continue the following story.

The mice were starving on their diet of grain, but got healthy when we switched to fruit, as the 
OPTIONS:
- grain lacked proper nutrition .
- fruit lacked proper nutrition .
Here's how I want to continue it:
grain lacked proper nutrition .