Option a is the correct answer. Raigarh was the capital of Shivaji. In 1674, after being crowned the king of the Maratha kingdom, Shivaji chose Raigad as his capital. There are many reasons that Raigad was chosen as the capital. One is that there is no easy access to the fort from any of the surrounding mountain ranges, as the mountain stands on its own. Decisive feature of Raigad fort is a mile and a half flat top which has adequate room for buildings. It was easy to administrator the kingdom and keep a watch on the enemy from it. Important Tips The significance of Raigad fort in Maratha history: In 1656, Chhatrapati Shivaji captured it from the More's of Javli who were under the suzerainty of the Adilshahi Sultanate. The fort not only helped Shivaji challenge the supremacy of the Adilshahi dynasty but also opened up the routes towards Konkan for the extension of his power. In 1662, Shivaji formally changed the fort's name to Raigad and added a number of structures to it. Shivaji passed away in Raigad in 1680 and was cremated at the fort. The British Gazette states the fort was known to early Europeans as the Gibraltar of the East.