The correct answer is option 1: Purushapura. Kanishka, also known as Kanishka the Great, was a powerful ruler of the Kushan Empire. He reigned from approximately 127 to 150 CE. During his reign, he established his capital city in Purushapura, which is present-day Peshawar in modern-day Pakistan. Purushapura was strategically located in the region and served as a center for trade, administration, and cultural exchange. Kanishka`s rule marked a significant cultural and economic flourishing in the region, and his capital city played a crucial role in facilitating these developments. It is important to note that while the provided answer is generally correct, there may be other sources that suggest different capital cities for Kanishka.