Solution: The process of improving the nutritional quality of food crops by agronomic methods, traditional plant breeding, or modern biotechnology is known as biofortification. Biofortification differs from conventional fortification in that it tries to boost nutrient levels in crops during plant growth rather than using manual methods during crop processing. Biofortification may thus be a viable option for reaching populations where supplements and traditional fortification methods are difficult to apply or limited. So, the correct option is (c).