Which of the following statement is correct regarding petrol engines?

• A. A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure
• B. The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug
• C. The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition
• D. All of the above