136. A 6-year-old girl presents in shock. She has a past medical history significant for a dilated viral cardiomyopathy with a baseline ejection fraction of 45%. Her current ejection fraction is 35%. Her current blood pressure is 130/80 mmHg. Which is the most appropriate agent to use in this child for cardiac support? (A) Norepinephrine (B) Milrinone (C) Dopamine (D) Phenylephrine