The Jacksons regularly receive wrong-number calls for Sara, whose phone number was misprinted in a directory. Sara contacted the Jacksons, informing them of the misprint and her correct number. The Jacksons did not lead Sara to believe that they would pass along the correct number, but it would be helpful to Sara and of no difficulty for them to do so. Thus, although it would not be wrong for the Jacksons to tell callers trying to reach Sara merely that they have dialed the wrong number, it would be laudable if the Jacksons passed along Sara' s correct number. Which one of the following principles, if valid, most helps to justify the reasoning in the argument? ['Being helpful to someone is laudable whenever it is not wrong to do so.', 'It is always laudable to do something helpful to someone, but not doing so would be wrong only if one has led that person to believe one would do it.', 'If one can do something that would be helpful to someone else and it would be easy to do, then it is laudable and not wrong to do so.', 'The only actions that are laudable are those that it would not be wrong to refrain from doing, whether or not it is difficult to do so.']