Plastic Speed

What happens to the speed of the sound and the light as it enters the plastic?

A) The sound will slow down and maybe stop; the light will speed up.
B) The sound will speed up; the light will slow down and maybe stop.
C) The sound and the light will travel at the same speed.

B. Sound tends to speed up in denser mediums, and light (or electromagnetic radiation) tends to slow down or get absorbed (stop?) in denser mediums.

Plastic Funnel/Funnul Runescape Speed Painting by Ruth Kan

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