I'll try to help because I've read this book before.
1. Cherry and Marcia dont beleive in seperating people because of their money.
2. Cherry and Marcia like hanging out with Ponyboy and Jhonny.
3. Jhonny and Ponyboy are friendly and nice to them. Which makes them nice to hang out with. Jhonny also defended Cherry.
One thing that can help is looking back at the book and getting information from it to know.