What does Scrooge do after the incident with the door
knocker?

He is visited by Marley's ghost

Explanation:

Instead of the door knocker, Scrooge sees Marley's face. Marley's face is not shadowed, like the rest of the objects in the yard, but is strangely illuminated. The expression on this disembodied face is neither angry nor violent; it looks just as Marley was apt to look when he was alive. Scrooge notes that the horrible specter of Marley's face rested on its otherworldly nature, not on its expression

answer: b

explanation:

it tells that they are they are trained over time since they are first born

explanation:

the silver bells of the sleds are merry and keep time in the winter nights while the sky twinkles happily. the golden bells of weddings are delightful in their peaceful happiness, foretelling a rapturous future. meanwhile, the brazen alarm bells scream frightfully in the night, with a discordant and desperate sound. in their clamor, these bells convey terror, horror, and anger. finally, the iron bells are solemn and melancholy, while those in the church steeple are like ghouls who feel happiness. the king of the ghouls, who rings the bells, cheerfully keeps time with the moaning and groaning bells.