Which of the following is not one of the reasons Christopher Hart offers in "Customers are your business: But why is it so hard to stay customer-centric?" as eroding customer focus in organizations?

a. Public companies become slaves to short-term earnings goals
b. Firms have a selling orientation (focused on selling/persuading)
c. A lack of employee compensation strategies rewarding customer focus
d. In fast growing firms, managers climbing the corporate ladder get further and further removed from customers