Correct option is B
In a four-stroke internal combustion engine, the working cycle is completed in two revolutions of the crankshaft. The four strokes are:
1. Intake stroke: The piston moves down, drawing the air-fuel mixture into the cylinder.
2. Compression stroke: The piston moves up, compressing the air-fuel mixture.
3. Power stroke: The spark plug ignites the compressed air-fuel mixture, causing an explosion that pushes the piston down, producing power.
4. Exhaust stroke: The piston moves up again, expelling the exhaust gases from the cylinder.
These four strokes require two complete revolutions of the crankshaft to complete one working cycle.
