When Light Travels from Air into Water

Multiple Choice

When light travels from air into water,

A) its frequency changes, but its velocity and wavelength do not change.
B) its velocity, wavelength and frequency all change.
C) its wavelength changes, but its velocity and frequency do not change.
D) its velocity changes, but its frequency and wavelength do not change.
E) its velocity and wavelength change, but its frequency does not change.