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(C) To determine the direction of wave propagation,we look at the motion of the particle at $x = x_1$. At $x = x_1$,the particle is on the rising slop

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$+x$

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(C) To determine the direction of wave propagation,we look at the motion of the particle at $x = x_1$. At $x = x_1$,the particle is on the rising slope of the wave and is moving upward. For a wave traveling in the $+x$ direction,the particles on the rising slope (where the slope is positive) move upward. Conversely,for a wave traveling in the $-x$ direction,the particles on the rising slope move downward. Since the particle at $x = x_1$ is moving upward,the wave must be propagating in the $+x$ direction.

The diagram shows a snapshot of a wave at time $t = 0$. The particle at $x = x_1$ is moving upward at that instant. The direction of propagation of the wave is:

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