Definition: You are given a question on high school physics. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: A beam of monochromatic light entering a glass window pane from the air will experience a change in
(A)frequency and wavelength (B)frequency and speed (C)speed and wavelength (D)speed only

C