Answer:
(b) to explain how light travels.
Explanation: Hope this helped
When Gerasim says: " It's God's will. We shall all come to it some day", He expresses that he is a believer. This is pretty much related to his spirituality.
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,

Answer:
Nick will need to go back and relate the events that led up to that moment in the story.
Jin Wang
Chin-Kee/The Monkey King
Wei-Chen Sun