When Light Travels from One Medium into a Different Medium

Multiple Choice

When light travels from one medium into a different medium with a different index of refraction,

A) the frequency, wavelength, and speed all change.
B) the frequency and wavelength change but the speed stays the same.
C) the speed and wavelength change but the frequency stays the same.
D) the speed and frequency change but the wavelength stays the same.
E) only the speed changes; the frequency and the wavelength stay the same.