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Which of these statements about double-clutching and shifting is true?

A You can use the tachometer to tell you when to shift.
Explaination
One way to determine when to upshift is with your tachometer. Before driving your vehicle, check the driver's manual to find out the recommended operating rpm range. As you're driving, keep your eye on your tachometer as your vehicle increases speed. Shift up when engine rpm gets to the top of the recommended range.
B Double-clutching should not be used when the road is slippery.
C Double-clutching should only be used with a heavy load.