Answer: C. tPA should be administered within 12 hours of the onset of a stroke.
Step-by-step explanation:
The tPA should be administered to the patient affected by the onset of the ischemic stroke within 3 to 4 hours, should not be waited for 12 hours. The tPA should be administered intravenously. When tPA administered through intraarterial infusion directly to the clot, it must be administered within 6 hours. During the fibrinolytic treatment it is important to monitor the blood pressure, as if the blood pressure is not controlled this can alter the treatment.