A farmer pulls the cord on the bell on his barn to signal everyone that it is time to eat. Which of the following factors would most impact the speed of the sound waves coming from the ringing bell?
(A) The type of metal that the bell is made of
(B) The force that the bell was struck with to start the vibrations
(C) The direction of the wave as the sound vibrates away from the bell
(D) The temperature and medium through which the sound is traveling