[Q]: How does the sentence end?

Staying on top of his finances was easy for Hunter but not Robert because 

[A]: Hunter had a lot of self discipline.


[Q]: How does the sentence end?

Jessica sometimes forgot to feed their goldfish but Patricia never did because 

[A]: Jessica was very irresponsible.


[Q]: How does the sentence end?

Being a writer was something that came easily to Matthew but not Kevin because 

[A]:
Matthew had a communication degree.