Mauricio Is Examining the Engine of His Motorcycle,trying to Understand

Mauricio is examining the engine of his motorcycle,trying to understand why he can't get maximum performance out of it.If he was a proponent of the concept of reductionism ,what would he do?

A) He would try adding different fuel additives to it to see if that would get better horsepower.
B) He would break it down into its smaller pieces to examine what each one does.
C) He would go out for a drive and listen carefully to the sound of the engine as it revs.
D) He would switch out the entire engine for one that he knows is working properly.