Read the excerpt below and answer the question. HALLY: That's perfectly correct. You see, you mustn't get the wrong idea about me and my Dad, Sam. We also have our good times together. Some bloody good laughs. He's got a marvelous sense of humor. Want to know what our favorite joke is? He gives out a big groan, you see, and says: "It's not fair, is it, Hally?" Then I have to ask; "What, chum?" And then he says: "A n****r's ar*e" . . . and we both have a good laugh. (The men stare at him in disbelief.) What's the matter, Willie? Don't you catch the joke? You always were a bit slow on the uptake. It's what's called a pun. You see, fair means both light in color and to be just and decent. (He turns to Sam.) I thought you would catch it, Sam. Why does Hally tell this joke to Sam and Willie?
A to make Sam and Willie laugh
B to explain to Willie what a pun is
C to hurt Sam and Willie with a racist joke
D to show the culture of white South Africans