Final Answer:
The symbolism of the cane reinforces the theme of the novel by ' highlighting Gregor's adjustment to being an insect ' (Option D).
Step-by-step explanation:
In the context of the novel, "the cane" likely refers to an item associated with Gregor's transformation into an insect. Option D, "Highlighting Gregor's adjustment to being an insect," aligns with the transformative nature of Gregor's condition. The use of a cane could symbolize his attempts to navigate and adapt to his new insect form, emphasizing the physical and psychological challenges he faces.
While other options may have symbolic significance in different contexts of the novel, the most fitting interpretation for reinforcing the theme of adaptation and transformation is the representation of Gregor's adjustment to his insect form.
Option D is the answer.