Imagine that we stand on any ordinary seaside pier, and watch the waves ... ...

Which one of the following is a reason for assuming that sunlight is constituted of waves of many colors?
(A) The mixture of waves that make up sunlight has to struggle through a variety of obstacles in the atmosphere.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Reading - Extra Reading: