Company president: Our consultants report that, in general, the most efficient managers have excellent time management skills. Thus, to improve productivity I recommend that we make available to our middle-level managers a seminar to train them in techniques of time management.

Question: Each of the following, if true, would weaken the support for the company president's recommendation EXCEPT:
Options:
A. The consultants use the same criteria to evaluate managers' efficiency as they do to evaluate their time management skills.
B. Successful time management is more dependent on motivation than on good technique.
C. Most managers at other companies who have attended time management seminars are still unproductive.
D. Most managers who are already efficient do not need to improve their productivity.
E. Most managers who are efficient have never attended a time management seminar.
Answer: "D"