问题详情

Why does Catherine say people themselves produce harmful vapors into the indoor air？
A．People shed more than any other animal indoors.
B．People do not keep their room tidy.
C．People"s skin flakes are small enough to float in the air and pollute the indoor air.
D．The furniture people buy is in bad quality.请帮忙给出正确答案和分析，谢谢！