In some appropriate units, time (t) and position (x) relation of a moving particle is given by t = x 2 + x . The acceleration of the particle is

1. A. + 2 2x+1
2. B. - 2 (x+2) 3
3. C. - 2 (2x+1) 3
4. D. + 2 (x+1) 3

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