A Manager in the Quality Control Division Makes the Following

A manager in the quality control division makes the following statement: "Our company's employee handbook makes it clear that the company's performance depends on effective leadership, and that all leaders at our company have managerial authority. Since my position as a manager in the quality control division clearly gives me managerial authority, I must be a leader in this company, and my leadership will guarantee the company's strong performance." The manager's argument assumes all of the following except which?

A) The employee handbook is a reliable source of information.
B) All managers are leaders.
C) All leaders are effective leaders.
D) Effective leadership is all the company needs for strong performance.
E) The manager was chosen for his position because of his leadership skills.