42- The middle-age man who has a 35- year smoking history presents to the Emergency Department confused and short of breath

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42- The middle-age man who has a 35- year smoking history presents to the Emergency Department confused and short of breath. Before starting oxygen, these saline arterial blood gases (ABGs) are obtained: 

ph.= 7.25, pCO2 = 50 mmHg, HCO3 =30 mEq/L, pO2 = 60 mmHg. 

These findings indicate to the nurse that the client is experiencing which acid-base imbalance?

a.     Respiratory alkalosis.

b.     Metabolic alkalosis.

c.     Metabolic acidosis.

d.     Respiratory acidosis.