Six nutrients needed by human body: protein, sugar, oil, vitamins, inorganic salts and water; Combined with the meaning of the question, steamed bread and rice are rich in starch and belong to sugar; Braised pork ribs, steamed fish and milk 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, braised beef is rich in protein, the option is wrong.

B, fried cabbage is rich in vitamins, so the choice is correct.

C, fried eggs are rich in protein, so the option is wrong.

D, boiled tofu is rich in protein, so the option is wrong.

So choose B.