The correct answer is option 3, Khadphises I. The Kushan dynasty was a ruling dynasty in ancient Central Asia and northern India from the 1st to the 3rd century AD. Khadphises I was one of the early rulers of the Kushan empire and is considered to be one of its most influential rulers. He expanded the territories of the empire in Central Asia and India and promoted trade and cultural exchange along the Silk Road. Khadphises I is also known for his patronage of Buddhism and the construction of Buddhist monuments. It is important to note that options 1, 2, and 4 are incorrect. Vikramaditya was a legendary king of ancient India, Danti Durga is not a ruler from the Kushan dynasty, and Pushyamitra was a ruler of the Maurya Empire, not the Kushan dynasty.