The answer to your question would be the last answer, starting with "Darkness, greed, and corruption" Charles Dickens creates this sense of darkness by the words he uses to describe the scene, such as "foul, cesspools, bad repute".
Tone is the attitude that the author has towards a subject or an audience. Mood is a literary device that has to do with the emotional feeling caused in readers by a literary work.
The tone and mood created by this excerpt is (D) darkness, greed, and corruption to give a realistic picture of the ugly side of urban London. To convey this tone and mood, he uses expressions such as "the shops and houses wretched", "the people half-naked", "crime, with filth and misery".
The answer is B. Charley noting/remembering the way Mr.Taft went is an implication that he will eventually have to remember the direction so he can follow him.
