Which sentence from "The treasure of Lemon Brown" contains direct characterization?

Question

a. His fathers words, like the distant thunder that now echoed through the streets of Harlem, still rumbled softly in his ears.
b. His father had been a postal worker for all Greg's life, and was proud of it, often telling Greg how hard he had worked to pass the test.
c. He sat a while, watching the sign blink first green then red, allowing his mind to drift to the Scorpions, then to his father.
d. He tried to figure out just where the breathing was coming from; he knew it was in the room with him
I think its either b or c, can anyone help?