Archaeologist have unearthed several thousand copper coins issued by:

Yaudhayas

The correct answer is Option (3) → Yaudhayas

The kushanas, however, issued the largest hoards of gold coins first gold coins c. first century CE. These were virtually identical in weight with those issued by contemporary Roman emperors and the Parthian rulers of Iran, and have been found from several sites in north India and Central Asia. The widespread use of gold coins indicates the enormous value of the transactions that were taking place. Besides, hoards of Roman coins have been found from archaeological sites in south India. It is obvious that networks of trade were not confined within political boundaries: south India was not part of the Roman Empire, but there were close connections through trade.

Coins were also issued by tribal republics such as that of the Yaudheyas of Punjab and Haryana (c. first century CE). Archaeologists have unearthed several thousand copper coins issued by the Yaudheyas, pointing to the latter’s interest and participation in economic exchanges. Some of the most spectacular gold coins were issued by the Gupta rulers. The earliest issues are remarkable for their purity. These coins facilitated long-distance transactions from which kings also benefited.