Problem: Frowning was something that Brian did a lot of compared to Brett, because

My choice: Brian was an unhappy person.

Problem: It is obvious Christopher has a bigger ego than Brian because

My choice: Christopher is always bragging about awards.

Problem: The clothing of Joel looks very raggedy, when you compare it to Aaron's.

My choice: Joel shops at Target.

Problem: Natalie must begin a strict diet and exercise regimen while Laura gets to slack off a bit because

My choice:
Natalie is extremely overweight.