The correct option is A Mohammed bin Tughlaq
During the rule of Mohammed- bin- Tughlaq, we observe the presence of gold and silver coins. But, it was difficult to get sufficient supply of these metals for using them as currencies. Hence, Mohammed-bin-Tughlaq replaced the gold and silver coins with copper and brass coins for better trade and commerce. However, the reforms to keep copper and brass coins as currency failed over a period of time.