What Is the Rationale for Turning the Top Bedding Down

What is the rationale for turning the top bedding down to the foot of the mattress and folding it back on itself when opening a bed for a client?

A) Protects the blanket from getting soiled
B) Keeps the rougher blanket away from the client's skin
C) Makes it easier for the client to handle the bedclothes
D) Makes the bed easier to get into