To do math homework, you gotta show us a picture and we can help you step by step, please, if you time edit your question and take a picture and I will guide you through it. :)
This tells me that Ralph has a lot of weight on his back. Everyone depends on him which makes him stressed and not want to deal with anything. He doesn't want to be the leader. This moment foreshadow's that something is going to come up and Ralph needs to take the leader position.
Best of luck,

I would have to say c or d
Seventy-two
Before:
Seventy-one
After:
Seventy-three