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Uh well actually-
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A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

Rules
This is a science community. We use the Dawkins definition of meme.
Trick question! They are all squares filled with pixels on a computer monitor, they emit light! The correct answer was "none of the above."
I've identified a bot account.
Ah but even the LCD panel reflects some light or else I wouldn't have to stare at myself when I end up in a dark videogame cave.
Trick trick question! Suppose I watched this on that one reflective LCD monitor with no backlight
Then all of the above would have been the correct answer.
But you didn't, did you? I can tell. You've got that "emissive display" vibe to you.
C'est ne pas un sock