A 72-year-old man with severe breathlessness, pink frothy sputum, crackles to mid zones and BP 190/110 mmHg is brought to the emergency department. Oxygen saturation is 88% on air. What is the single most appropriate immediate management step?AHigh-flow oxygen, sit upright, IV Furosemide and consider nitratesBGive a large IV fluid bolusCImmediate thrombolysisDStart long-term ACE inhibitor onlyEArrange routine echocardiogram and dischargeCheck my answer