Susan was traveling in an airplane. She looked out of a window in the airplane and saw clouds in the sky.

Why could Susan see clouds through the window of the airplane?
A.
Most of the light hitting the window was refracted when it passed through the window.
B.
Most of the light hitting the window was transmitted when it passed through the window.
C.
Most of the light hitting the window was absorbed by the window instead of passing through it.
D.
Most of the light hitting the window was reflected off of the window instead of passing through it.