Unfortunately, I picked A but here's why D is correct: The underlined part is an appositive. This type of modifier describes the adjoining noun. So A implies that conspiracy enthusiasts are based on... But this cannot be the case. Conspiracy theory can be based on the underlined portion, enthusiasts cannot.
Now if you look at D, the sentence makes sense. The appositive correctly describes conspiracy enthusiasts. D says that using this, that and more, enthusiasts have concluded something. Perfect.
The
...
Now if you look at D, the sentence makes sense. The appositive correctly describes conspiracy enthusiasts. D says that using this, that and more, enthusiasts have concluded something. Perfect.
The
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