Which of the following functions does not represent a traveling wave

A

$$y=A\sin^2 \left[\pi\left(t-\frac{x}{v}\right)\right]$$

B

$$y=Ae^{-\alpha t}\cos(kx-\omega t)$$

C

$$y=A\sin\left[(kx)^2-(\omega t)^2\right]$$

D

$$y=A\cos\left[(kx-\omega t)^2\right]$$