Respuesta :
Answer:
The word which has a meaning most similar to the meaning of "proper" in the passage is the following one:
Appropriate.
Explanation:
Gregor Samsa had a "proper" human room, that is, his room was appropriate for a human being, since it was up to a regular standard of what a human room is expected to have as its basic features. In fact, the beginning of the paragraph could be rewritten in the following way:
"His room, which was appropriate for a human being, although a little too small, lay peacefully between its four familiar walls."