Explanation:

Correct Option: (d) Explanation:  All statements are correct Supplementary notes: Mixed Farming  Mixed Farming is practiced in the highly developed parts of the world, e.g. Northwestern Europe,  Eastern North America, parts of Eurasia and the temperate latitudes of Southern continents.  Mixed farms are moderate in size and usually the crops associated with it are wheat, barley, oats, rye, maize, fodder and root crops.  Mixed farming is characterized by high capital expenditure on farm machinery and building, extensive use of chemical fertilizers and green manures and also by the skill and expertise of the farmers.  Equal emphasis is laid on crop cultivation and animal husbandry in the Mixed  Farming. Animals like cattle, sheep, pigs and poultry provide the main income along with crops.  Fodder crops are an important component of mixed farming .  Crop rotation and intercropping play an important role in maintaining soil fertility .