A client on prolonged bed rest has develop

问题：

A client on prolonged bed rest has developed a pressure ulcer. The wound shows no signs of healing even though the client has received skin care and has been turned every 2 hours. Which factor is most likely responsible for the failure to heal

A．Inadequate vitamin D intake.

B．Inadequate protein intake.

C．Inadequate massaging of the affected area.

D．Low calcium level.