Reasonable nutrition refers to the complete variety, sufficient quantity and appropriate proportion of nutrients contained in the diet, which are in balance with the needs of the body. A balanced diet is the core of reasonable nutrition. A healthy diet should be reasonable and balanced, with diversified foods, reasonable combination of meat and vegetables and comprehensive and reasonable nutrition. Millet porridge mainly provides starch; Roasted chicken legs and yogurt mainly provide protein and fat; Lack of vitamins in this diet will lead to insufficient vitamin intake, so add fruits and vegetables, such as oranges.

So choose: C.