Mintzberg's Research on Managers Showed Which of the Following

Mintzberg's research on managers showed which of the following?

A) Managers work at an unrelenting pace.
B) Managers work under varying degrees of pressure, sometimes being very busy, and sometimes much less busy.
C) Managers prefer written media.
D) Managers have a preference for historical data rather than "live action."
E) Managers typically begin a task and then work on it until it is finished.