A nurse is caring for a client who is postoperative following a total hip arthroplasty. Which of the following findings indicates that the client is experiencing a complication

a) The client reports that the sequential compression devices (SCDs) are uncomfortable.
b) The client reports pain at the surgical site as 4 on a scale of 0 to 10.
c) The client's surgical site dressing has required changing twice in 2 hr due to drainage.
d) The client needs assistance with a walker when ambulating in the room.