The Perioperative Nurse Noticed Abrasions on a Patient's Elbows When

The perioperative nurse noticed abrasions on a patient's elbows when she visited him in the intensive care unit (ICU) the day after his 6-hour abdominal surgery.The patient told her that the ICU nurses had difficulty pulling him back up in bed every time he slid down toward the bottom,and he was not able to be much help in moving himself.This skin injury was probably the result of which physical force?

A) Heat and moisture from prolonged bed rest
B) Pressure of his elbows resting on the bed for 2 days
C) Friction from his elbows rubbing over the sheets when slid up in bed
D) Negativity from the bath blankets the nurses stacked to make arm rests for the patient