Incomplete question. I inferred this to be the complete the options:
(1) experience of the narrator
(2) diversity of the participants
(3) importance of rivers
(4) renewal of the planet
Answer:
(1) experience of the narrator
Explanation:
We note these words in lines 5, "Beside the dead car he stood with his head bent, listening, and there was not a sound. Everything on the planet might have died in the cold."
