Progressive Wave: Solve Puzzle at Point P

[Seneka]

The answer is B but I don't understand how. Surely, the string at point P is moving upwards.
This video gave a solution but the part that they have indicated as down is a different part of the string and not P.

 

[jedishrfu]

P is stationary and the wavefront is moving to the right hence P moves downward the wave reflects how the string is shaped.

P is attached to the string and the wave moves along the string but the elements of the string are stationary in a horizontal sense that is they don't move left and right.