Twelve hours following a unilateral total knee replacement, a client reports being unable to sleep because of severe incisional pain. What is the best initial nursing action?

A Instruct the client in use of the prescribed patient-controlled analgesia (PCA) pump. B Assist the client in assuming a lateral recumbent position for comfort. D Apply ice to the incision for twenty minutes prior to joint flexion exercises. C Initiate continuous passive motion (CPM) to relieve muscle spasms.