How can a farm pond be useful for a farmer?

Correct answer: By storing rainwater and helping irrigation

A farm pond is a small water-storage structure made on or near farmland. It can collect rainwater and runoff during the rainy season and keep some of that water available for later use. A farmer may use the stored water for supplemental irrigation during dry periods, especially when rainfall is irregular. It can also help reduce dependence on immediate rainfall, although its usefulness depends on size, soil, rainfall, evaporation, and safe management.

Option A is correct because storing rainwater and using it for irrigation is the main agricultural purpose described. A pond is not designed to destroy seeds, isolate crops from markets, or increase storage pests. It is an example of water harvesting and conservation. The pond may not provide enough water for every crop or season, so it should be understood as a support to water availability rather than a guaranteed complete irrigation source.