The points on the curve $y=\sin x$ where the tangent lines are parallel to $x-$ axis are given by

• A

  $x=n\pi ,n\in z$

• B

  $x=2n\pi ,n\in z$

• C

  $x=\left(2n+1\right)\frac{\pi }{2},n\in z$

• D

  $x=\left(2n+1\right)\pi ,n\in z$