I MIGHT GET WARNED FOR THIS SO DON'T REPORT ME
The four<span> separate </span>strokes<span> are termed: ... While the piston is at T.D.C. </span><span>the compressed air-fuel mixture is ignited by a spark plug (in a </span>gasoline engine) or by heat generated through high compression<span>, forcefully returning the piston to B.D.C.
Hope this helps! : )</span>
The answer is C , what else would you do with the mouse?