Final answer:
Every successful trader trades based on analysis and strategy, which includes market study and risk management, rather than relying on emotions, intuition, or luck.
Step-by-step explanation:
The question asks about the basis on which every successful trader trades. The most professional approach to trading, as implied by the question, is C) Analysis and strategy. Successful traders rely on thorough analysis of markets, which includes fundamental and technical analysis, and they operate according to strategies that help manage their risks and capitalize on opportunities. While factors such as intuition and emotions can sometimes play a role in decision-making, they are often considered less reliable. Relying on luck is not a sustainable approach in trading.