[Q]: How does the sentence end?

We had to spray herbicide on the corn, but didn't have to for the wheat, as the 
OPTIONS:
- corn was vulnerable to disease.
- wheat was vulnerable to disease.

[A]: corn was vulnerable to disease.


[Q]: How does the sentence end?

Joel made a chart to make sure Matthew did chores, but 
OPTIONS:
- Joel forgot to add vacuuming.
- Matthew forgot to add vacuuming.

[A]: Joel forgot to add vacuuming.


[Q]: How does the sentence end?

I prefer to use a laptop instead of a computer because the 
OPTIONS:
- laptop can be taken everywhere.
- computer can be taken everywhere.

[A]:
laptop can be taken everywhere.