Some people prefer to avoid facing unpleasant truths and resent those whose unwanted honesty forces them into such a confrontation. Others dislike having any information, however painful, knowingly withheld from them. It is obvious then that if those in the former group are guided by the directive to treat others as they themselves want to be treated, __. Which one of the following most reasonably completes the argument above? ['they will sometimes withhold comment in situations in which they would otherwise be willing to speak', 'those in the latter group will respond by concealing unpleasant truths', 'they will sometimes treat those in the latter group in a manner the members of this latter group do not like', 'those in the latter group must be guided by an entirely different principle of behavior']