Six nutrients needed by human body: protein, sugar, oil, vitamins, inorganic salts and water; Combined with the meaning of the question, the main component of rice is sugar, and stewed beef, spicy tofu and egg soup contain oil, protein and inorganic salts, 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.

A, milk is rich in protein, so the option is wrong.

B, steamed crucian carp is rich in protein, so the option is wrong.

C celery and lily are rich in vitamins, and the choice is correct.

D, braised pork is rich in oil, so the option is wrong.

So choose: C.