Concept:Farm settlement schemes need a balanced system that provides both food and income.Explanation:Mixed farming combines crop production and animal rearing on the same farm.This system reduces risk because farmers can rely on both crops and livestock.Livestock waste can be used to enrich the soil for crop growth.Pastoral farming involves only livestock, while mixed cropping and continuous cropping involve only crops.Thus, mixed farming is the most suitable and sustainable choice for a farm settlement scheme.Answer:D. mixed farming