Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?（）<br>A:To allow for greater expansion due to higher operating temperature<br>B:To seal the cylinder against leakage of combustion gases<br>C:To provide an additional surface for oil cooling<br>D:To provide an additional strength for the crown and lower structure

Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?（）
A:To allow for greater expansion due to higher operating temperature
B:To seal the cylinder against leakage of combustion gases
C:To provide an additional surface for oil cooling
D:To provide an additional strength for the crown and lower structure

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