that's hilarious lol
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[answer]
Due to insufficient information, there is no clear answer.
Any answer ("none", or any combination of A, B, &/or C) could be correct.
Why?
[answer]
(1) A could be on a downslope while parked or moving, or decelerating at level, and/or
(2) B could be at level while parked or moving (at constant velocity) [1], and/or
(3) C could be on an upslope while parked or moving, or accelerating at level
Even making the simplifying assumption of "at level" for all cases, the answer is still ambiguous, because (2).
[1] Or hell, it could even be decelerating on an upslope (or accelerating on a downslope) at just the right balance between gravity, mass of liquid, and rate of change of velocity - and if so inclined (ha-ha), one could juggle those variables for A and C in just the right way so as to justify any answer with respect to them, as well.