Explanation:

Raigarh (Correct): Raigarh Fort served as the capital of the Maratha Empire under Chhatrapati Shivaji Maharaj from 1674, when he was crowned, until his death in 1680. It was strategically chosen for its defensibility and central location within his nascent kingdom, and Shivaji Maharaj invested significantly in developing it as a formidable fort and royal seat. Pune: While an important city for the Marathas, especially later under the Peshwas, it was not the capital during Shivaji Maharaj's reign. Karwar: This coastal city was part of the broader region influenced by Maratha power but never served as Shivaji Maharaj's capital. Purandar: Purandar Fort was a significant military stronghold and played a role in treaties, but it was not the capital of Shivaji Maharaj's kingdom.