Explanation:

- Article 2: This article allows Parliament to admit or establish new states into the Union of India. It is primarily concerned with states that are not originally part of India.

- Article 3: This article is the correct answer. It specifically empowers Parliament to create new states, alter the areas, boundaries, or names of existing states within India.

- Article 9: This article deals with the idea of citizenship, particularly governing individuals voluntarily acquiring citizenship of a foreign state. It is unrelated to state formation.

- Article 1: This article simply states that India, that is Bharat, is a Union of States, detailing the country's structure and territories.