Explanation:

- Option 1: Article 330

- Correct Answer

- Article 330 provides for the reservation of seats for Scheduled Castes (SC) and Scheduled Tribes (ST) in the Lok Sabha, ensuring their adequate representation.

- Option 2: Article 339

- Focuses on the control of the central government over the administration of Scheduled Areas and welfare of Scheduled Tribes.

- Option 3: Article 275

- Pertains to grants-in-aid from the Union to certain states, particularly for promoting the welfare of Scheduled Tribes.

- Option 4: Article 366

- Contains definitions related to various terms used in the Indian Constitution, including Scheduled Castes and Scheduled Tribes.