B would be the answer I think
they all include studying, either history or people, or nature. they all include observing something and studying it.
Afterimages is known to be the illusion that best illustrates the opponent process.
<h3>What is the opponent process?</h3>
Note that The opponent-process theory is most useful for telling an attribute of Afterimages
This theory states that opposing retinal processes (red-green, yellow-blue, white-black) helps to bring about color vision.
Therefore, Afterimages is known to be the illusion that best illustrates the opponent process.
Learn more about opponent process from
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