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【单选题】
患者，男性，68岁，因近日咳嗽、咳痰、气急明显，伴烦躁、发绀而入院。既往有慢性阻塞性肺疾病史。动脉血气分析pH7.31，PaO 2 56mmHg，PaCO 2 72mmHg，给予低浓度氧疗的依据是（）。
A.
利于应用呼吸兴奋药
B.
慢性呼吸衰竭时，呼吸中枢对CO的刺激非常敏感
C.
缺氧是维持患者呼吸的重要刺激因子
D.
氧浓度大于30%易引起氧中毒
E.
高浓度氧疗容易使患者呼吸兴奋
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