Concept:Stock exchange dealers who trade based on expected price changes are known as speculators.Explanation:In the stock market, different participants have distinct roles. Bulls, bears, and stags all share a common feature: they buy or sell securities anticipating future price movements to earn profits. A bull expects share prices to rise and buys in advance. A bear expects prices to fall and sells to buy back later at lower rates. A stag subscribes to new issues hoping to sell them quickly at a premium. Because such activities are driven by price speculation rather than long-term investing, these dealers are grouped under speculators. Other options like actuaries, promoters, and underwriters perform different functions related to risk assessment, company formation, or guaranteeing share sales.Answer:C. speculators