The theme is about who is the most powerful.
Q1: A Because Banging modifies noise.
Q2: B, no name it given, and it isn't the narrator, Robert Frost.
True, the supporting details should some in the following paragraphs (that's what I learned anyway - it may be wrong)
It represents both the whole world and Autumn. Hope it helped!
What story is it that this 'passage' came from?