If the displacement $S$ of a particle travelling along a straight line in $t$ seconds is given by $\mathrm{S}=2 \mathrm{t}^3+2 \mathrm{t}^2-2 \mathrm{t}-3$, then the time taken (in seconds) by the particle to change its direction is

• Correct answer
  A

  $\frac{1}{3}$
• B

  $2$
• C

  $3$
• D

  $\frac{1}{2}$

Hence, the correct answer is option: 'A'.