Respuesta :
Because by definition a wave travels at the same speed through any given medium, A, C, and D, are all out. B is true, though. Frequency and wavelength can change within a medium itself. Therefore, B, both its frequency and wavelength, is the answer you desire.
Answer:
B: both its frequency and wavelength
Explanation:
If the medium the wave is traveling through remains the same, the speed would stay the same.