One theme from the metamorphosis is that loneliness can make a person feel isolated from others. which passage from the story best supports this theme?

The answer is D. Hearing these words from his mother made Gregor realise that the lack of any direct human communication, along with the monotonous life led by the family during these two months, must have made him confused — he could think of no other way of explaining to himself why he had seriously wanted his room emptied out.