What changes in the materials that is useful to the environment?

A.) Throwing Detergents into the sewage
B.) Cutting and shaping lumber into chair
C.) Cutting of fabric to be made into clothes
D.) Cutting into wood to be made into Table

What Happened to the sorounding air that is covered with smoke from Factories and motorized Vehicles? The Air Becomes____

A.) Clean
B.) Fresh
C.) Polluted
D.) unpolluted​