The diameter of a piston is usually less at the crown than at the skirt, in order to （）.<br>A:facilitate the installation of piston rings<br>B:allow for the expansion of the piston during operation<br>C:prevent crankcase vapors from entering the combustion chamber<br>D:reduce wearing of the upper cylinder liner

The diameter of a piston is usually less at the crown than at the skirt, in order to （）.
A:facilitate the installation of piston rings
B:allow for the expansion of the piston during operation
C:prevent crankcase vapors from entering the combustion chamber
D:reduce wearing of the upper cylinder liner

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