Concept:Drying removes excess moisture from grains to preserve their quality and germination ability.Explanation:Freshly harvested grains contain high moisture.High moisture encourages the growth of moulds and attracts pests.Drying lowers the moisture content and reduces pest activity.This prevents damage to the embryo and maintains the grain’s ability to germinate.Therefore, drying increases seed viability, not moisture content or nutrient content.Answer:C. seed viability