Which of the following statements correctly describes the relation between frequency, wavelength energy and velocity of a wave travelling in a medium? A. As wavelength decreases, frequency increases, energy increases and the speed remains the same.

B. As wavelength increases, frequency decreases, energy increases, and speed remains the same.

C. As wavelength increases, frequency increases, energy decrease and the speed increases.

D. As wavelength decreases, frequency decreases, energy decreases, and the speed decreases.