Given that markets are efficient, which of the following is least likely to cause an actively managed mutual fund to underperform an index fund（）

A. Taxes.

B. Inferior stock selection.

C. Management expenses.

德鲁克认为，组织中的目标可分为战略目标、策略目标以及（），它们分别由组织中的各级管理人员和（）来制定。