In the comic strip by Mauricio de Sousa, the characters Cebolinha and Cascão play a game using two cans and a string. When they realize that sound can be transmitted through the string, they decide to change the length of the string to make it increasingly longer. All other conditions remained unchanged during the game.
In practice, as the length of the string increases, there is a reduction in which characteristic of the sound wave?
(A) Pitch.
(B) Period.
(C) Amplitude.
(D) Velocity.
(E) Wavelength.