Diamonds are glittering and attractive because light incident on them undergoes A. Highest refraction B. Multiple internal reflections C. Multiple surface reflections D. Hundred percent transmission

The correct answer is: B. Multiple internal reflections.

When light hits a diamond, it is refracted (bent) as it passes from the air into the diamond. The light is then reflected off the back of the diamond and refracted again as it passes back into the air. This process of refraction and reflection happens multiple times, which is what causes the diamond to sparkle.

The other options are incorrect because:

• A. Highest refraction is not the correct answer because the refraction of light in a diamond is not the highest possible.
• C. Multiple surface reflections is not the correct answer because the multiple reflections of light in a diamond are not the only reason why it is sparkling.
• D. Hundred percent transmission is not the correct answer because not all of the light that hits a diamond is transmitted through it.

I hope this helps! Let me know if you have any other questions.