none of them have drivers, they're all parked, a and b on inclines.
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*a and c
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3rd stab: A is parked in a really steep down slope, B in a flat area, C in a really steep up slope.

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4th stab: all parked, there's a supermassive object in front of A and another behind C.
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None, neither is a real truck, on account of this arrangement being really dangerous BC of sloshing.
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Ce n'est pas un auto
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Truck question. None. Trucks can’t drive, only people can drive trucks, thus the trucks aren’t driving. Q.E.D.
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Not sure that the truck being stopped makes sense if they’ve indicated a direction. Zero vectors do not point in any particular direction.
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*Answer: All, any, none; insufficient information.