Problem: Jason got over their case of the flu before William did, because 

My choice: Jason 's immune system was generally more healthy.


Problem: Justin went to see William who was a therapist, and 

My choice: Justin told them all about their problems.


Problem: At the doctor's office Matthew was diagnosed with Epilepsy by Jason and 

My choice: Matthew was scared.


Problem: Joseph spoke German better than Joel because 

My choice:
Joseph had been studying the language for a longer amount of time.