With reference to a normal human being which one of the following statements is not correct?

• A. Compared with skeletal muscles, the tissues of intestine are mush more affected by the shortage of oxygen.
• B. In the arterial blood. haemoglobin is normally 97% saturated with oxygen
• C. Pulmonary artery contains deoxygenated blood.
• D. About 70% of the carbon dioxide entering the erythrocytes react with the water to form carbonic acid.