Explanation

The word in the blank must be a characteristic of something written in jargon that makes the writing difficult to understand for the general public. Risible means laughably absurd, which is sometimes, but not always a characteristic of jargony writing.

Vapid means boring, which might also sometimes be true of this type of writing, but this word has the connotation of lacking in substance, which political theory usually is not. Uncanny and occult mean strange.

While an unfamiliar writing style might indeed seem strange to the general public, these words have a supernatural connotation, which would not be a good fit for a description of political theory. Muddled and abstruse both mean confusing, which would be characteristics that would describe jargony writing from the perspective of the general public.

Hence options C and D is correct!

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