Which of the following statements is incorrect about index funds?

A. They are likely to overinvest in stewardship.

B. The Big Three managers obtain substantial revenues from administering and managing the defined contribution plans of many of their portfolio companies.

C. Investment managers of index funds receive fees that are a tiny fraction of assets under management (AUM).

D. The percentage of corporate equity ownership held by index funds is rising.

EXPLANATIONS ARE NEEDED!