Answer:
D. flexible
Step-by-step explanation:
An exchange rate set by the market forces is a flexible exchange rate or a floating exchange rate. The demand and supply forces of the currency determine the exchange rate in the Forex market. Since governments are a major stakeholder in a country's exchange rate, it makes some efforts to influence the exchange rate.
If the demand for a currency is high, its value increases, meaning other countries will spend more buying it. When demand is low, its value declines, which makes imports expensive.