[Q]: How does the sentence end?

I spent more time typing my report than I did typing the article because the 
OPTIONS:
- report was longer.
- article was longer.

[A]: report was longer.


[Q]: How does the sentence end?

The stones that I found at the beach were worse than the rocks I found earlier, because the 
OPTIONS:
- stones were common.
- rocks were common.

[A]: stones were common.


[Q]: How does the sentence end?

Elena wants to run for political office and Jennifer supports them, but 
OPTIONS:
- Elena isn't sure they are qualified.
- Jennifer isn't sure they are qualified.

[A]:
Jennifer isn't sure they are qualified.