Leadership depends as much on making one' s followers aware of their own importance as it does on conveying a vivid image of a collective goal. Only if they are convinced both that their efforts are necessary for the accomplishment of this goal, and that these efforts, if expended, will actually achieve it, will people follow a leader. If all of the statements above are true, then which one of the following CANNOT be true? ['Some leaders who convince their followers of the necessity of their efforts in achieving a goal fail, nevertheless, to lead them to the attainment of that goal.', 'Sometimes people who remain unsure of whether their efforts are needed for the attainment of a collective goal nevertheless follow a leader.', 'Only if one is a leader must one convince people of the necessity of their efforts for the attainment of a collective goal.', "One who succeeds in conveying to one's followers the relationship between their efforts and the attainment of a collective goal succeeds in leading these people to this goal."]