Maurice Works for Logan Trainers,a Company That Provides Management Development

Maurice works for Logan Trainers,a company that provides management development workshops for businesses.Maurice is very popular and companies often ask for him by name,even though Logan has a lot of different instructors it could assign to workshops.Logan pays all instructors the same amount for teaching a workshop,but last week Maurice asked that he be given a higher rate of pay than the other instructors because he is so popular with companies.If the following facts were known,which one would MOST strengthen Maurice's case?

A) He has led more training workshops than any other seminar leader who is employed by Logan.
B) If Logan lost Maurice,companies might stop coming to Logan for management development workshops.
C) Maurice has worked for Logan for fifteen years,which is longer than any other instructor.
D) Maurice is also a teacher in the local high school,and he has received several awards for his teaching.
E) The businesses that contract with Logan say that the workshops are essential to their operation.