Problem: The paper that Eric wrote was worse than that of Dennis, because

My choice: Dennis paper was grammatically correct.

Problem: Learning was always easier for Patricia than it was for Laura, because

My choice: Patricia studied a lot more.

Problem: Angela was always trying to push traditional values onto Natalie, but

My choice: Angela couldn't get them to stop being rebellious.

Problem: Tanya has agreed to clean and brush Angela's matted fur, because

My choice:
Tanya wants to help him.