In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.<br>A:crosshead<br>B:crankpin<br>C:crank journal<br>D:gudgeon pin

In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.
A:crosshead
B:crankpin
C:crank journal
D:gudgeon pin

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