Farmers practice mixed farming because they can

Farmers practice mixed farming because they can specialize in either growing crops or rearing animals. This means that they can focus on what they are good at and maximize their productivity. Additionally, mixed farming allows farmers to use the manure from the animals to fertilize their crops. This is beneficial because the manure is a natural and organic source of nutrients that can improve the soil fertility and enhance crop growth. By combining crop production and animal rearing, farmers can create a sustainable and integrated farming system where the waste from one aspect of the farm becomes a valuable resource for another. This helps to reduce the need for artificial fertilizers and promotes environmentally friendly farming practices. Therefore, option C is the correct answer.