Millie Millions Has Been for Many Years the CEO of Got

Millie Millions has been for many years the CEO of Got Rocks Corporation, and for ten years she has also been a member of the Board of Directors of the Giant Huge Corporation.As it happens, Ronnie Rich, who is the CEO of Giant Huge, is also a director of Got Rocks.This relationship is called

A) cumulative advantage.
B) an interlocking directorate.
C) the shrinking middle.
D) corporate mobility.
E) a merger.