Nahapana was a famous ruler associated with which power?

Correct answer: Western Kshatrapa

The governing concept is the identification of important rulers with their dynastic or political power. Nahapana was a prominent ruler of the Western Kshatrapas, also called the Western Satraps, who controlled parts of western India in the early centuries of the Common Era. Therefore, option B is correct. His rule is especially important because he came into conflict with the Satavahana ruler Gautamiputra Satakarni, who defeated him and reasserted Satavahana authority in some western regions. Option A is incorrect because the Kushanas formed a different imperial power farther north and northwest. The Guptas belong to a later major dynasty, while the Cholas were a southern power associated with a different historical context. The name Nahapana should therefore be linked with the Western Kshatrapas.