Answer :

The force always acts in the direction of the mean position and at point C it is acting towards O and away from A. Thus positive.

Also, acceleration is in the direction of force thus it is also acting in the same direction as force and is positive.

Also, the direction of motion is towards A and thus velocity is also positive.

Hence option (a) is correct.

b) when particle is at C the velocity is in direction towards O thus positive and hence option (b) is incorrect.

c) when the particle is at 4 cm away from B and moving towards The acceleration and force are directed towards mean position O and also since it is moving towards A then all velocity, acceleration and force are negative in signs. Option c) is correct.

d) acceleration and force is always towards mean position O and thus at B the acceleration and force is negative. Thus correct.

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