How Did Politics Play a Role in GM's Reorganization of the Hierarchy

How did politics play a role in GM's reorganization of the hierarchy?

A) Managers with nonsubstitutability were promoted to top positions.
B) Coalitions were formed at the subunit level that had to be broken down.
C) Managers previously empowered were now forced to answer to a centralized board.
D) The board of directors used authority to remove most of top management.