[Q]: How does the sentence end?

The contagious disease was passed to Brett and not Steven because 

[A]: Steven has a strong immune system.


[Q]: How does the sentence end?

Megan said it would be liberating to go out without makeup like Elena does. 

[A]: Elena never wore makeup when she left the house.


[Q]: How does the sentence end?

January came and Betty made a new year’s resolution while Carrie didn’t bother because 

[A]:
Betty  was motivated.