During the period from 1940 to 1972, the United States moved to a major reliance on chemical pesticides. Alternate control strategies were deemphasized, because
a. the government told farmers to use chemicals
b. there were no other options besides chemicals
c. the public wanted chemical residues on their fruit, vegetables, and other food products
d. chemical control gave excellent results at a low cost
Answer: d. chemical control excellent results at a low cost
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