A Likely Reason That Managers of U

A likely reason that managers of U.S. firms earn so much more than their European and Japanese counterparts is that

A) the cultural, ethical, and legal constraints in Europe and Japan prevent too high a salary being paid; the social norms and laws are different in the U.S.
B) managerial talent is harder to find in the U.S. than in Europe and Japan.
C) shareholders in European and Japanese companies play a more active role in corporate governance.
D) a larger salary is necessary to attract and retain top CEOs in the U.S. than it is in Europe and Japan.