Problem: Justin is more socially successful than Ian because

My choice: Justin has a very confident personality and strong character.

Problem: Jeffrey was the receptionist for the company while Derrick was the data clerk because

My choice: Jeffrey liked to work with people.

Problem: When Megan put on the costume, Katrina gasped, so

My choice: Megan felt embarrassed and ran away.

Problem: Christopher had a grumbling stomach but not Nelson because

My choice:
Nelson had had waited a shortened time for lunch.