Scavenging in a four-stroke/cycle diesel engine occurs during the （）.<br>A:last part of the exhaust stroke, and the first part of the intake stroke<br>B:last part of the intake stroke only<br>C:early part of the injection stroke only<br>D:early part of the power stroke

Scavenging in a four-stroke/cycle diesel engine occurs during the （）.
A:last part of the exhaust stroke, and the first part of the intake stroke
B:last part of the intake stroke only
C:early part of the injection stroke only
D:early part of the power stroke

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