How did Phillip show he was a good problem solver?

The Cay is a super good book and I have read it- Philip shows that he is a good problem solver when timothy dies in the hurricane and Philip is left to live on his own. He still manages to get food for himself, bury Timothy's body, get attacked by an eel and live, and signal for people to save himself.

Exanation:

"the sandy walls seemed to collapse in on themselves"

and

"the bloodshot waters seemed to have no bottom"

i cannot see any of the options