The displacement of a particle executing simple harmonic motion is given by $x=2 \cos (t)$, where $t$ is the time in seconds. Then, the time period of the particle is:

  • A
    $\pi \text{ s}$
  • B
    $2 \pi \text{ s}$
  • C
    $3 \pi \text{ s}$
  • D
    $0.5 \pi \text{ s}$

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