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Which one of the following statements is incorrect for disposing of waste?

A) Wet and dry waste mud: be disposed off separately.

B) Biodegradable waste must be dumped in pits where it can be changed into manures.

C) Dirty water should be treated before letting it into seas and rivers.

D) Tall chimneys with filters must be fitted in factories to release smoke away from populated places.

E) None of these