Final answer:
The theme that this passage most clearly helps develop is even at the end of the world, reverence for nature is necessary.
Step-by-step explanation:
The theme that this passage most clearly helps develop is c. even at the end of the world, reverence for nature is necessary. The characters in this excerpt are discussing the absence of nature and the impact it has on their lives. While one character claims that there is no more nature, the other character argues that if they are still able to breathe and change, then nature has not forgotten them. This highlights the importance of nature and the need to appreciate it, even in difficult circumstances.