In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt, the "piston ring belt" means （）.<br>A:piston crown<br>B:piston ring groove<br>C:piston skirt<br>D:piston ring area

In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt, the "piston ring belt" means （）.
A:piston crown
B:piston ring groove
C:piston skirt
D:piston ring area

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