Problem: Benjamin was essential to the overall plan Donald was putting into action, because

My choice: Donald needed someone to open the safe.

Problem: Doug had a lot of pain in his knee even after his shoulder was completely healed, because the

My choice: shoulder was healthier.

Problem: Christine asked Lindsey if she would set the dining room table but

My choice: Lindsey did not want to do it.

Problem: Robert has a much easier time managing the heat than Samuel because

My choice:
Samuel lives in Russia.