[Q]: How does the sentence end?

Maria had a lot less friends than Tanya because 

[A]: Maria had always been a shy person.


[Q]: How does the sentence end?

Of the two, Robert is less intelligent than Brian is. That's because 

[A]: Robert dropped out of college.


[Q]: How does the sentence end?

Megan made a grain free cake from a cookbook for Sarah, and Monday at the office 

[A]:
Megan presented it to her.