According to Murray Askinazi, the charge for an outpatient MRI is based on the following f

According to Murray Askinazi, the charge for an outpatient MRI is based on the following factors EXCEPT______.

A．the maintenance of the machinery

B．staff salaries

C．local taxation

D．malpractice insurance fees

请帮忙给出正确答案和分析，谢谢！