Concept:Speculation is the act of trading securities to profit from future price changes.Explanation:In the stock exchange, some people buy or sell shares expecting a rise or fall in price.This activity involves both risk and the possibility of a large gain.Buying and selling stocks in anticipation of price changes is called speculation.Hedging is used to reduce risk, while forecasting and projection only predict future prices.Therefore, the correct term for this activity is speculation.Answer:D. speculation