Problem: How does the sentence end?

Although Aaron was a happier person than Samuel, 
OPTIONS:
- Aaron frequently varried in their own self esteem.
- Samuel frequently varried in their own self esteem.
Answer: Aaron frequently varried in their own self esteem.

Problem: How does the sentence end?

Derrick's Spanish speaking is native, while Craig can't speak it. 
OPTIONS:
- Derrick lives in Mexico City.
- Craig lives in Mexico City.
Answer: Derrick lives in Mexico City.

Problem: How does the sentence end?

Christine is a faster driver than Rachel because 
OPTIONS:
- Christine is always in a hurry to get everywhere.
- Rachel is always in a hurry to get everywhere.
Answer: Christine is always in a hurry to get everywhere.

Problem: How does the sentence end?

Lawrence always felt more comfortable mingling at parties then Dennis did because 
OPTIONS:
- Lawrence was an introvert.
- Dennis was an introvert.
Answer:
Dennis was an introvert.