Which one is not periodic

• A

  $|\sin 3 x|+\sin ^2 x$
• Correct answer
  B

  $\cos \sqrt{x}+\cos ^2 x$
• C

  $\cos 4 x+\tan ^2 x$
• D

  $\cos 2 x+\sin x$

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