The displacement of a particle as a function of time is shown in the figure. The figure shows that [CPMT 1970, 86]

• A.                 The particle starts with certain velocity but the motion is retarded and finally the particle stops
• B.             The velocity of the particle is constant throughout
• C.             The acceleration of the particle is constant throughout.
• D.             The particle starts with constant velocity, then motion is accelerated and finally the particle moves with another constant velocity