Answer:
The correct answer is C - The speaker's description of what birds see that "we" do not supports a theme related to living beings' connection to nature.
Step-by-step explanation:
In "Thaw" by Edward Thomas, the speaker describes the scene of half-thawed snow and the rooks sitting in their nests, watching the winter pass. The imagery of the birds in their nests, delicately perched on the elm-tops, emphasizes the idea of a connection between living beings and nature. The line "What we below could not see" suggests that the speaker is observing the world from a perspective that is different from our own, and that this different perspective offers a unique understanding of the natural world.
This description of the natural world emphasizes the idea that humans are part of the natural world, and that our understanding of it is limited. The theme of living beings' connection to nature is thus supported by the speaker's description of what the birds see, and how they are able to observe the natural world in a way that we cannot.