Which sentence from “the treasure of lemon brown” contains direct characterization?

a his father’s 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.