A transverse wave on a string has an amplitude a. A tiny spot on the string is colored red. As one cycle of the wave passes by

Option D) 4A

Explanation:

As the cycle of the wave passes by, the amplitude gives the longest journey when the spot travels from the undistributed position. During each cycle the spot travels "Four times".

Considering one of this cycle, if it begins to travel from it's undistributed position, there would be four movements i. e

* Upward movement through distance A

*Downward movement through distance A

*Downward again through distance A

*Upward through distance A.

Then it would travel back to its undistributed position held