When does the family experience the most tension leading toward the climax in The Metamorphosis?

A. Gregor realizes that his family is better off without him escape from his room.

B. Gregor tries to stop the chief clerk from leaving. Only to be stopped by his father and driven back into his room.

C. the three boarders see Gregor and get upset. Which causes Grette to say it's time to get rid of Gregor.

D. Gregor's mother sees Grette hanging on the wall.