Problem: Nelson was terrified when they saw Steven have a seizure, but

My choice: Nelson tried to help.

Problem: He knew that the sun was closer to earth than the other star, because the

My choice: sun was brighter.

Problem: Creating a website was easier for Christopher than Aaron because

My choice: Aaron didn't know how to use computers.

Problem: Dennis enjoys walking in the park but Christopher enjoys playing videogames, therefore

My choice:
Dennis is generally more fit.