Why don't we see sunlight in VIBGYOR ?

Question

$\begin{array}{1 1} (a)\; \text{due to distortion of rays by earth's atmosphere} \\ (b)\; \text{due to distortion of rays by air molecules} \\ (c)\; \text{due to distortion of rays by pollution} \\ (d)\; \text{all the above} \end{array}$