An object's position as a function of time is given by the equation y(t) = 5 - 7t ^{2} + 2t^{3}. Its acceleration is

A. constant with an undetermined value.

B. varies with time, with a value of -14 m/s ^{2} at t = 0.

C. varies with time, with a value of 0 at t = 0.

D. constant with a value of -9.8 m/s ^{2}.

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