Acceleration of a particle changes when:

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(C) Acceleration is defined as the rate of change of velocity with respect to time,given by $\vec{a} = \frac{d\vec{v}}{dt}$.Since velocity $\vec{v}$ i

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Both of the above

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(C) Acceleration is defined as the rate of change of velocity with respect to time,given by $\vec{a} = \frac{d\vec{v}}{dt}$.Since velocity $\vec{v}$ is a vector quantity,it has both magnitude (speed) and direction.If the magnitude of velocity changes,the particle undergoes acceleration.If the direction of velocity changes,the particle also undergoes acceleration (e.g.,in uniform circular motion).Therefore,if either the magnitude or the direction of velocity changes,the acceleration of the particle changes.Thus,the correct option is $(c)$.

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