Final answer:
It's unclear which literary work is being referenced for the character Gregor and the lodgers. Generally, in literature, when lodgers move in, their room may be used for their own personal living space or other purposes as agreed.
Step-by-step explanation:
The scene in a literary work where, after three lodgers rent a room in an apartment, the protagonist's room is repurposed for other uses. However, without specific reference to the title or author of the work in question, it's challenging to provide a precise answer to what Gregor's room is used for.
Usually, when lodgers move into an apartment, the space they take up might be transformed into a storage area, living space for the lodgers, or could be kept vacant as part of the agreement.
Gregor is afraid of other people, afraid of open spaces, and afraid of the uncertainty that life is outside of the walls of his room. His room represents certainty, safety and peace to him. He never wants to leave it.