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When driving on grades, which of these is the best choice for a safe speed?

A Based on your vehicle and its cargo, select a speed that is safe within the posted limit.
Explaination
When driving on a downgrade, select a speed that is appropriate for the total weight of your vehicle and its cargo, the length and steepness of the grade, the road conditions, and the weather. Never exceed the posted speed limit or the speed indicated on any posted "Maximum Safe Speed" sign.
B If you have a light load, go faster than you would with a heavy load.
C Follow the vehicle in front of you.