Answer:
D . No one is paying attention to the tree.
Step-by-step explanation:
According to the sentence, the tree is described as being on its own, where it is "gnawed by squirrels" because there is "no hand to pluck its fruit" and there is no "dancing on the green beneath" which all signifies that no one is paying attention to the tree.
It appears that the tree has been left untended and as a result, squirrels have been eating its fruit.