Stimulus
A tiny crab that lives 550 meters below the surface of the Gulf of Mexico has been found to have eyes that are sensitive to ultraviolet light. But ultraviolet light from the sun cannot penetrate to that depth. If the crab’s ultraviolet receptors developed as an adaptation to the depths, they are the crab is not itself bioluminescent, it probably hunts bioluminescent prey.
What this question is testing
Your task
Find the choice that makes the argument's conclusion less likely to be true.
Common trap
Answers that look negative but attack a claim the argument never relied on.
Winning move
Find the assumption the argument depends on, then pick the choice that undermines it.
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