Step 1: Concept After the power stroke, the cylinder is filled with hot exhaust gases that must be replaced by fresh air.
Step 2: Meaning In 2-stroke engines particularly, the fresh air is used to push out the exhaust gases simultaneously.
Step 3: Analysis Scavenging is the specific technical term for this process of "flushing" or clearing out the burnt gases from the combustion chamber.
Step 4: Conclusion The removal process is called scavenging.
Final Answer: (D)