What is primarily responsible for the blue coloring of uranus and neptune?

The methane in Uranus upper atmosphere absorbs the red light from the Sun but reflects the blue light from the Sun back into space, This is why Uranus appears blue, that is the same reason Neptune appears blue.

Ido not know at all

The best answer is (a) which is universal law is in effect at all times. it is constantly at play in everything we do and governs our lives. it is also important to note that universal law applies to not only everything on earth, but everything in the universe as well, which is another reason why it is in effect at all times.