Which statement by a subordinate poses the greatest challenge for the leader?

The statement regarding the challenges of implementing changes reflects a deeper concern about the feasibility and practicality of the leader's plans. When a subordinate expresses doubt about the implementation of changes, it signifies potential resistance, which can hinder progress and morale within the team. This challenge can be especially significant as it points to possible gaps in communication or understanding between the leader and the team regarding the expected outcome of the changes.

In contrast, the other statements indicate a search for clarity or engagement rather than outright skepticism. For instance, expressing that the leader may not have heard the team's input seeks to open a dialogue and emphasizes the importance of collaboration. Asking about the direction implies the subordinate is looking for guidance, which is generally a positive sign of engagement. Lastly, requesting an explanation for why a suggestion won't work shows a willingness to understand and learn from the leader. Each of these other statements tends to foster discussion and allows for the potential to refine ideas, while the first statement presents a more significant barrier by challenging the leader's authority and vision directly.