What is most clearly the central idea of the paragraph?

"Because they come from a business background, executives tend to have little to no understanding of their company's product or service—whether it's frozen potatoes or deep tissue massages. Why, therefore, would an executive ever bother to invest in his company's product or service when he can invest in sales, marketing, account management, or something else that has meaning in his world?"

A. Sales, marketing, and similar departments are superior.
B. Middle managers are in the best position to make company decisions.
C. Companies tend to marginalize their products and services.
D. Executives are largely unremarkable people who play it safe.