Answer:
I would argue that option D contributes the most to the overall tone of the passage selected. The theme is the changing of the seasons, and given the imagery of "summer the prairie is an anvil's edge", the subsequent line of "foliage seems to writhe in fire" adds to the tone of destruction as the seasons change; it evokes the setting of a busy smithy, full of heat and smoke, where new things are forged from old ones.
Step-by-step explanation: