Which of the Following Findings Supports the Idea That Leadership

Which of the following findings supports the idea that leadership can be taught?

A) Managers' understanding of transformational leadership decreased in the experimental group, but not the control group.
B) Employee self-reported attitudes were enhanced in the control group, but not the experimental group.
C) Organizational measures of financial performance were enhanced in both the control group and the experimental group.
D) Employee views of managers' transformational leadership were more positive in the experimental group than in the control group.