Correct option is (b) Kushanas
The Kushans were most probably one of five branches of the Yuezhi confederation, an Indo-European nomadic people of possible Tocharian origin, who migrated from northwestern China (Xinjiang and Gansu) and settled in ancient Bactria. The founder of the dynasty, Kujula Kadphises, followed Greek religious ideas and iconography after the Greco-Bactrian tradition, and also followed traditions of Hinduism, being a devotee of the Hindu God Shiva. The Kushans in general were also great patrons of Buddhism, and, starting with Emperor Kanishka, they also employed elements of Zoroastrianism in their pantheon. They played an important role in the spread of Buddhism to Central Asia and China.
