Which of the following is an example of a non-chemical mosquito control method?

Removing standing water is an effective non-chemical mosquito control method because it eliminates the breeding grounds for mosquitoes, which require stagnant water for their larvae to develop. By addressing the environmental conditions that allow mosquitoes to reproduce, this method significantly reduces their population without the need for chemical intervention.

In contrast, using insect repellent and spraying insecticides involves the application of chemicals specifically designed to affect mosquito behavior or physiology. Setting up mosquito traps may utilize various attractants and could be combined with chemical means, depending on the type of trap. Thus, removing standing water stands out as solely an environmental management strategy that does not rely on chemical substances.