Why is the use of organic manure useful in farming?

Correct answer: It can improve soil structure and nutrients

Direct answer: Option A, it can improve soil structure and nutrients. Organic manure is made from natural materials such as animal dung, compost, leaves and plant remains. When added to soil, it supplies or helps release useful nutrients and adds organic matter. This organic matter can make soil more crumbly, improve its ability to hold water and air, and support helpful soil organisms. Healthier soil can support better plant growth when other needs are also met. Option A is correct because it states the normal agricultural benefit without claiming an absolute result. Option B is wrong because properly prepared manure does not always make soil poisonous; harmful effects may occur only through contamination or misuse, not as its basic purpose. Option C is wrong because organic matter generally helps water-holding and root conditions rather than stopping plants from taking water. Option D is wrong because manure supports farming instead of making it impossible. Reasoning: natural waste → decomposition → organic matter and nutrients → improved soil condition. Memory cue: organic manure means feeding the soil, not merely feeding the crop.