B, False. According to the Christian Apologetics & Research Ministry (CARM), there are six reasons to why you should witness to other people, and even though the sense of duty to other people is amongst them, it's not purely out of it. You should witness because Jesus commands you to, because you must love the unsaved, because it's a wise thing to do, because you must keep people out of hell, because it pleases God and brings glory to his name and because this may lead to people finding love and fellowship of God.