Motion of light at the constant speed of light tells us:
different colors of light travel at different constant speeds.
light moves instantly from all objects to earth.
we see distant objects as they were long ago.
light causes many optical illusions

Different colors of light travel at different constant speeds.

Explanation:

The white light is composed of of different colors , i.e. , VIBGYOR , Violet , indigo , blue , green , yellow , orange , red .

When the white light is dispersed into different colors of VIBGYOR , all color bend by different velocities , and speed of the light is independent of time .

Hence , from the given options , the correct answer for eh motion of light , is ,  the Different colors of light travel at different constant speeds .

the awnser is a

it is not b or c