I believe the answer is D
Answer:
There is a problem at the lab that he works at so he has to rush there.
Nature's beauty, human connection with nature, and self-consciousness are the major themes of this poem
Hi!
Every fall, the oak tree in the garden sheds its leaves.
The answer isn't their, because there is only one tree.
It isn't there because there isn't used as a possessive noun.
And it isn't it's because it's means it is.
So the answer is its.
Hope this helps! :)