Given below are two statements, one is labelled as
Assertion (A): In deep sea, water is coloured.

Reason (R): Scattering of light occurs in deep sea.
Select the correct answer using the options given below:

The correct answer is: D. Both (A) and (R) are true and (R) is the correct explanation of (A).
Explanation - 
Assertion (A) is true: Water in the deep sea appears colored (specifically blue).
Reason (R) is true: The blue colour of the deep sea is due to the scattering of shorter wavelengths of light (blue light) by water molecules, while longer wavelengths (red, orange, yellow) are absorbed more.
Correct Explanation: Because the phenomenon of scattering is precisely the reason the water appears blue, Reason (R) is the correct explanation for Assertion (A).