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B
10%
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C
16%
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D
20%
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Solution
The correct option is C 16% Inhaled air contains more oxygen used to create energy and less CO2. It contains 21% O2, 0.04% CO2 and 79% Nitrogen. Exhaled air contains 16% O2, 4% CO2 and 79% Nitrogen. Thus, option C is correct.