According to Peter Drucker, Which of the Following Should Be

According to Peter Drucker, which of the following should be taken into consideration when improving leadership effectiveness?

A) Managers can help cultivate leadership if they start with the newest employees.
B) There is only one best style of leadership.
C) The difference between how frequently and how effectively managers exhibit various leadership behaviors has no effect on employees.
D) Effective leaders should take responsibility for decision.
E) Leaders share their ideas first and then take suggestions from their subordinates.