Correct Option: A

Chandra Gupta was a major king in the Gupta Empire around 320 C.E. and is generally considered as the founder of the Gupta dynasty. As the ruler of the Gupta Empire, he is known for forging alliances with many powerful families in the Ganges region. The well known Gupta era which commenced on February 26, 320 AD is generally attributed to Chandragupta I. Hence it is surmised that the Gupta era began on the occasion of the coronation of Chandragupta I.