A particle in SHM is described by the displacement function $\mathrm{x}\left(\mathrm{t}\right)=\mathrm{Acos}(\mathrm{\omega t}+\mathrm{\varphi })$. If the initial (t = 0) position of the particle is 1 cm, its initial velocity is p cm$s^{-1}$ and its angular frequency is π rad s^-1 , then the amplitude of its motion is

• A

  π cm

• B

  2 cm

• C

  √2 cm

• D

  1 cm