Why do they buy some vegetables?

Read the text and answer the questions.

Going Shopping

    Today is Sunday. Intan and her mother go to a traditional market. Traditional market is a kind of place where you can buy almost anything you need for your daily life such as rice, vegetables, fruits and clothes, accessories, and even jewelries.
    First Intan and her mother buy rice, flour, sugar, eggs, and cooking oil. Then, they go to the greengrocer to buy some vegetables for soup. They also buy oranges and papayas.
    After that, they go to a store. Intan wants to buy a new uniform and a pair of shoes. After that, they have lunch and go home.

Why do they buy some vegetables?