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

A. Of jamming of respiratory tract

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

C. apable of absorbing oxygen</strong>

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

E. Of clotting of blood

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