A 50 kg woman with severe metabolic acidosis has the following parameters:pH 7.05,pCO2 12 mm Hg,pO2 108 mm Hg,HCO3 5 mEq/L base excess -30 mEq/L.The approximate quantity of sodium bicarbonate that she should receive in half hour is:

• A. 500 mEq.
• B. 750 mEq.
• C. 250 mEq.
• D. 1000 mEq.