You've got a world-class vocabulary if you chose answer B! Marco Polo, the great medieval explorer, was probably alive when "outright" first came into English. And if Marco had spoken English, it's a word he might have used often: one of its earliest senses meant "straight ahead," as in "travel outright two hundred miles." Perhaps because going straight ahead implied doing something to its completion, or going "all out" as we'd say, "outright" picked up the extended sense of "entirely" or "completely." Later, it gained two other familiar senses: "without holding back" (as in "laughing outright at the joke") and "on the spot" (as in "moldy fruit that was thrown away outright").