A pond contains clean water. Which of the following activities will produce least pollution of water?

Swimming in the pond will produce the least pollution of water because no harmful pollutants or any chemicals would be involved in the process.

•Washing of clothes would release the soap and detergent being used in to the water.

•Animals might be covered with dust and excreta which when they bathe will get washed in the water of the pond.

•Washing motor vehicles too would cause pollution because motor vehicles produce soot and other harmful particles which will get washed in the water.