The correct option is A Roman period
Besant is a medieval term for a gold coin. Medievally originally it meant the gold coins produced by the government of the Byzantine Empire. The word was derived from the Greek Byzantium. Later in the medieval era among the Latins the scope of the word was expanded to gold coins produced by Arabic governments. Standardized Roman currency was used throughout the Roman Empire. Important Roman gold and silver coins were continued into the Middle Ages .
Ancient and early medieval coins in theory had the value of their metal
content, although there have been many instances throughout history of
the metal content of coins being debased, so that the inferior coins
were worth less in metal than their face value.