[Q]: How does the sentence end?

Cynthia's diet is much more healthy than Elena's is because 

[A]: Elena is a couch potato.


[Q]: How does the sentence end?

Brian usually washed the tiny spots from the glasses for Eric after dinner because 

[A]: Brian had better vision.


[Q]: How does the sentence end?

Natalie grossed Laura out with all the grime under their fingernails, because 

[A]:
Laura valued people keeping themselves clean.