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Option 4 : Pesticides are poisons and can cause a number of health effects on humans.
Option 4 is the correct answer as it talks about how pesticides affect the humans. Pesticides are toxic and when used more then a certain amount can cause a lot of issues to humans. If pesticides are used in more quantity in agriculture then the crops consumed by humans will have a very bad effect on their health.
Other options talk about the advantages of using pesticides, such as they are used to kill insects as wasps, ants or mosquitoes. They are also used to kill weeds. A common pesticide DDT is sprayed on the house walls which prevents malaria.
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