[单选题]
______
A .This allowed scientists to gauge the pace and progress of the ecological recovery.
B .Yet in other businesses, such as farming and property development, ant surveys aren't used widely.
C .Employing those people are expensive.
D .They do this by sorting the ants, counting their numbers and comparing the results with those of earlier surveys.
E .The evolution of ant species may have a strong impact on our ecosystem.
F .Others will die out for lack of food.
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