What Did a Study of 173 Firms Over a 25-Year

What did a study of 173 firms over a 25-year period reveal about CEOs of successful corporations?

A) They tended to have less loyalty than former CEOs, switching companies as a faster pace.
B) They tended to have the same functional specialization as the former CEO.
C) They tended to be more aggressive in their risk-taking than former CEOs.
D) They tended to rely more on skills developed through group decision making.
E) They tended to be turnaround specialists.