Problem: Mary was prone to depression while Monica was not, because

My choice: Mary was a naturally optimistic person.

Problem: Tanya uses a sugar scrub and Lindsey doesn't because

My choice: Lindsey doesn't believe in taking care of the skin.

Problem: Kenneth tries to always think positive compared to Michael because

My choice: Kenneth is a very optimistic person.

Problem: While they were knitting sweaters, Logan did poorly while Ryan was skillful, so the sweater of

My choice:
Logan turned out sloppy.