Six nutrients needed by human body: protein, sugar, oil, vitamins, inorganic salts and water; Combined with the meaning of the question, the main components of rice are sugar, potato roast beef, steamed osmanthus fish and sparerib soup, which mainly 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. Vegetables are rich in vitamins and inorganic salts, so vegetables can provide vitamins and inorganic salts for the human body.

So choose B.