A Patient Who Has Been in the Hospital for Several

A patient who has been in the hospital for several weeks is about to be discharged.The patient is weak from the hospitalization and asks the nurse to explain why this is happening.The nurse's best response is "You are weak because

A) your iron level is low. This is known as anemia."
B) of your immobility in the hospital. This is known as deconditioning."
C) of your poor appetite. This is known as malnutrition."
D) of your medications. This is known as drug induced weakness."