Which Statement by the Nurse Best Demonstrates Clear Communication to Nursing

Which statement by the nurse best demonstrates clear communication to nursing assistive personnel (NAP) about delegating a task?

A) "Record how the patient's intake and output of fluids, please"
B) "Take the patient's temperature, pulse, respirations, and blood pressure every 2 hours today."
C) "Take the patient's temperature every 4 hours; notify me if it is greater than 100.5°F (38.1°C) ."
D) "Assist the patient with all of her meals so she will take in more calories."