Problem: Aaron eats a lot of potatoes in their diet, whereas Joseph prefers steak, so

My choice: Aaron has a carb heavy diet.

Problem: William consistently got trounced by Benjamin in tennis, because

My choice: William was just an inferior player .

Problem: So

My choice: Christopher planted the tree because Christopher wanted to watch it grow, while Derrick wanted to destroy it.

Problem: Ryan's fish tank looks really clean, and Nelson's looks really dirty because

My choice:
Ryan cleans regularly.