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(C) The velocity of a particle is defined as the rate of change of displacement with respect to time, given by the slope of the displacement $-$ time

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Zero

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(C) The velocity of a particle is defined as the rate of change of displacement with respect to time, given by the slope of the displacement $-$ time graph.If the displacement $-$ time graph is parallel to the time axis, it means that the displacement of the particle does not change as time passes.Since the displacement remains constant, the change in displacement $(\Delta s)$ is $0$.Therefore, velocity $(v = \frac{\Delta s}{\Delta t})$ is $0$.

If the displacement $-$ time graph for a particle is parallel to the time axis, what is the velocity of the particle?

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