The correct answer is D. Skandagupta.
The Hunas were a nomadic people from Central Asia who invaded India in the 5th century CE. They were a major threat to the Gupta Empire, which was at its peak at the time. Skandagupta was the Gupta emperor who led the defense against the Hunas. He was a successful military leader and was able to repel the Huna invasion. However, the Gupta Empire never fully recovered from the Huna invasion and began to decline in the 6th century CE.
A. Budhagupta was the Gupta emperor who ruled after Skandagupta. He was not able to match Skandagupta’s military success and the Gupta Empire continued to decline under his rule.
B. Kumaragupta-I was the Gupta emperor who ruled before Skandagupta. He was a successful military leader and was able to expand the Gupta Empire. However, he died young and his son, Skandagupta, had to deal with the Huna invasion.
C. Kumaragupta-II was the Gupta emperor who ruled after Budhagupta. He was not a successful military leader and the Gupta Empire continued to decline under his rule.