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C. It lowers the cost of food.

Explanation:

A chemical pesticide is a chemical formulation which is used to kill insects and pests feeding upon the crop. It is capable of reducing and even entirely eliminating the infesting insect colonies.  

Apart from the positive effects of the technology with the use of chemical pesticides. One negative effect is the chemical pesticide can lower the cost of food. This is because of the fact that the chemical pesticide can deteriorate the quality of the food. It can distort the color, shape and appearance and even can change the taste hence will lower the cost of the food.