The logical fallacy that Zion's parents have used is D. Slippery slope
This refers to the type of fallacy that is used to show that one event would lead to many unfortunate events.
Hence, we can see that from the given narration, Zion wants to get a tattoo and his parents refused because they said it would make him wayward and this is an example of Slippery slope fallacy.
Read more about Slippery slope fallacy here:
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