This could be true. What matters is that people are convinced that their efforts will achieve the goal, not whether or not the goal is actually achieved.

This could be true. (B) tells us that if we succeed in conveying the relationship between people’s efforts and attainment of the goal, then we will succeed in leading them to the goal. Like for (A), nothing in the stimulus contradicts any claims about actually achieving goals.

Could be true. (C) says that if you convince people of the necessity of their efforts, then you are a leader. The stimulus gives necessary conditions for when leaders are followed; (C) gives a sufficient condition for being a leader, which isn’t inconsistent with the stimulus.

This could be true. The stimulus gives two necessary conditions for following a leader; the information in (D) that people can succeed without having been convinced that they could succeed is independent of the information in the stimulus.

This must be false. As shown below, (E) meets the sufficient condition of “follow leader” but fails the necessary condition of “efforts necessary,” which contradicts the stimulus.