The correct answer is Water.
What are the characteristics of speed of light?
The speed of light is the speed electromagnetic waves travel. The speed of light is 3.0 x 108 m/s in space. The speed of light is the same in all matter.
Why does speed of light decrease in water?
The answer to the question above is that photons interact with molecules in the water which takes some time causing the net speed to drop.
Learn more about the speed of light here: brainly.com/question/9796619
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