The correct option is B Hunas
The Gupta empire was an ancient Indian empire founded by Sri Gupta that lasted from 240 to 590 CE. At the beginning of the 4th century, the Guptas established and ruled a few small Hindu kingdoms in Magadha and around modern-day Bihar and covered most of North-central India. Their period of reign was called Golden Age of India. In 480s, Huns invaded the Gupta empire and weakened it. Soon after the invasions, the Gupta Empire, ended as well.