[Q]: How does the sentence end?

The exams were held in the library rather than the classroom, as the 

[A]: library was a quieter environment.


[Q]: How does the sentence end?

Nick bought a electric toothbrush for Eric and 

[A]: Nick decided to buy one for themselves.


[Q]: How does the sentence end?

Brian had a more close knit family than Adam who was from a broken home, so 

[A]:
Brian seemed friendlier.