Which statement is true about air pollution
选项：

A:The inadequately releasing of treated water into natural water bodies can lead to the degradation(恶化) of water ecosystem.
B:The source of outdoor noise worldwide is mainly caused by machines, transport and transportation systems.
C:Air pollution makes people sick, causes breathing problems and even promotes cancer.
D:The toxic chemicals that pollute the soil can get into our body when we eat fruits and vegetables that have been grown in polluted soil.