Which Statement by the Registered Nurse (RN) Best Demonstrates Clear

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

A) "Record the patient's intake and output of fluids throughout the shift, 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 meals so that the patient's intake of calories will increase."