A farmer who used pesticides is mainly contributing to water and land pollution in the environment.
What is pollution?
The spread of harm to the environment by the way of voluntary and man-made efforts in such a way that the purity of natural elements in the environment are lost or disturbed, it is known as pollution.
Use of pesticides causes land pollution as the fertility of the land is lost. It also causes water pollution, as the pesticide water that flows from fields gets assimilated into water bodies like river.
Hence, option D holds true regarding pollution.
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