A is correct.
Explanation: Because it's means it is
Its means something like theirs, itself, e.x - the dog likes to curl up in its bed.
<span>a condition attached to an agreement.</span>
1) based on “grove” and “nature” i would assume a variety animal calls
2) “sad thoughts” seem to refer to the “what man has made of man” as it seems the poet is upset that the link of nature and soul is mended in some way. this could be reference towards deforestation or other acts we have caused to destroy nature
