the astronauts' blood will become acidic as CO2. Thus, Option a. is correct.
Carbon dioxide gets released into the atmosphere through human activities, which include the burning of fossil fuels and forests and also through the production of cement. Since CO2 is known as Carbon Dioxide, so inhaling this Carbon dioxide can always prove fatal to human beings and astronauts are no exception to that. Humans always breathe in oxygen.
Our body structure is made in such a way that we are incapable of breathing in carbon dioxide. If we breathe in carbon dioxide, then, our body is incapable of handling it appropriately.
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