Marketing Often Doesn't Get the "Respect" It Deserves as a Professional

Marketing often doesn't get the "respect" it deserves as a professional field of study, primarily because

A) compared to other business functions, it has had few useful metrics to measure its performance impact.
B) people generally don't understand what marketing is or what it does.
C) marketing is all about the emotion and less about facts.
D) marketing positions tend to pay less than other business functions.
E) it fails to impact the bottom line of the company and isn't factored into executive decisions.