(CO 7) What has been the result for air quality from strict emission controls?
a-Strict

emission controls have resulted in a dramatic improvement in air quality.

b-Strict emission controls have led industrialists to be contrite and to stop polluting.

c-Strict emission controls are largely ignored thus air quality has dramatically decreased.

d-The growth in use of automobiles and trucks has wiped out much of the gain from emission controls.

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