Which Task Could Not Be Delegated by the Nurse to the Unlicensed

Which task could not be delegated by the nurse to the unlicensed assistive personnel (UAP) ?

A) Monitor client's vital signs and oxygen saturation every 4 hours.
B) Measure client's blood pressure and report to the nurse after administration of routine daily antihypertensive medication.
C) Monitor vital signs of client who complained of chest pain,requiring three doses of nitroglycerin to resolve,earlier in the shift.
D) Measure vital signs on client who had a stroke 3 years ago and is admitted for urinary tract infection.