The nurse is providing care for an immobilized client. For this client, the most appropriate and most effective nursing intervention would be （）.
A．getting the client out of bed and into a chair for 30 minutes, twice daily.
B．avoiding repositioning the client if he's comfortable.
C．repositioning the client on alternate sides at least every 2 hours.
D．positioning the client with the greatest pressure at the bony prominence.
