Which is the best title for the passage

A．Industries tend to disregard the laws because they don't want to spend extra money on the processing of industrial wastes.
B．Although measures are taken to send industrial pollutants higher up the atmosphere, the amount of industrial pollutants remains the same.
C．The smokestacks built to release pollutants are not tall enough.
D．Only a small number of industries are equipped to live up to the new standards of the air pollution laws.

A．Fish in the lakes die because acid rain deprives them of oxygen.
B．Fish in the lakes die from taking in poisonous substances released from the acids.
C．Fish in the lakes die from direct contact with accumulated acid in the water.
D．Air pollutants are dissolved in the water and thus kill the fish.