Rice is rich in sugar, fried pork liver, prawns and steamed crucian carp are rich in protein, and braised pork is rich in fat, indicating that the vitamin content in food is less. Therefore, in order to make the nutritional collocation more reasonable, it is necessary to supplement foods rich in vitamins.

Fried eggs mainly provide protein and fat; Porridge mainly provides water; Vegetarian fried vegetables are rich in vitamins; Spiced meat mainly provides protein and fat.

So choose C.