On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because __________________?

A. Of jamming of respiratory tract

B. Of clotting of blood

C. It forms CO2 by combining with oxygen present in the blood

D. apable of absorbing oxygen</strong>

E. It forms carboxyhemoglobin by combining with haemoglobin of blood, thereby making it
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