Answer: b. The quantity of the country's currency supplied exceeds the quantity demanded.
Step-by-step explanation:
A country operating a fixed-exchange rate system would be actively trading its currency to ensure that it remains at a certain rate. If the currency is overvalued, it means that the currency is actually weak and is being propped up by the company's actions in the forex market.
A reason for the weakness would be that the supply is higher than the demand of the currency which means that, as per the rules of supply and demand, the currency is trading at a lower price, i,e., it is weak.