What is the purpose of the given-below action?

What is a foot plate used for in the first place? The most common reason is to make sure that the part of the body that is affected will be able to stabilize itself. In the case of the patient, it is the left leg that has gotten affected. The leader has asked the nurse to place the footplate there in order to prevent foot drop.

This means that B is the answer to this question. There are other things that can be done to prevent the patient from falling off the bed. There are also other things that can be done in order to prevent the pressure from the feet.