Which One of the Following Corporate Board Characteristics Usually Improves

Which one of the following corporate board characteristics usually improves corporate governance?

A) ceo is not the chairman of the board.
B) the board has many outsiders who have lots of other important commitments.
C) the board is as large as is possible.
D) board members are paid at a rate higher than their peers and their payment is mostly cash.
E) the board has a majority of insiders from company management on it who bring first-hand knowledge of how the company operates.