[Q]: How does the sentence end?

Their mother trusted Derrick over Dennis with the car because 

[A]: Derrick was more cautious when driving.


[Q]: How does the sentence end?

Before going off to work, Felicia went to the nursery to drop off Rebecca because 

[A]: Rebecca was the child.


[Q]: How does the sentence end?

Erin was ready to retire but Rachel was not able to yet because 

[A]:
Erin was old.