Man dies in the atmosphere of CO, because it A. Dries up the blood B. Combines with O2 present in the body C. Reduces the organic matter of tissues D. Combines with the haemoglobin of blood, thereby making the later incapable of absorbing O2

The correct answer is D. Carbon monoxide (CO) combines with the hemoglobin of blood, thereby making the latter incapable of absorbing oxygen. This prevents the body’s tissues from getting the oxygen they need, which can lead to death.

Option A is incorrect because carbon monoxide does not dry up the blood. In fact, it can actually cause the blood to thicken, which can make it more difficult for the heart to pump.

Option B is incorrect because carbon monoxide does not combine with oxygen present in the body. Instead, it binds to hemoglobin, which is the protein in red blood cells that carries oxygen.

Option C is incorrect because carbon monoxide does not reduce the organic matter of tissues. Instead, it prevents the body’s tissues from getting the oxygen they need, which can lead to cell death.