Which Action Is Best for the Nurse to Include in the Plan

Which action is best for the nurse to include in the plan of care in order to improve sleep quality for a critically ill patient in the intensive care unit (ICU) ?

A) Ask all visitors to leave the ICU for the night.
B) Lower the level of light from 8:00 PM until 7:00 AM.
C) Avoid the use of opioids for pain relief during the evening hours.
D) Schedule assessments to allow at least 4 hours of uninterrupted sleep.