A Client in Semi-Fowler's Position Has Slipped Down in Bed

Multiple Choice

A client in semi-Fowler's position has slipped down in bed and needs to be moved up.Which of these actions should the nurse take FIRST?

A) Ensure the bed is below waist level,and lower the head of the bed.
B) Lower the side rails on the side where the nurse is standing.
C) Ask the client to bend the knees,and place the feet flat on the bed.
D) Change the bed linens.