Which sentence is wrong because it's not parallel?
Big wave surfing is supposedly both a tremendous thrill and an extraordinary danger.
Big wave surfing is supposed to offer both tremendous thrills and extraordinary dangers.
Big wave surfing is supposed to be both tremendously thrilling and extraordinarily dangerous.
Big wave surfing is supposed to be both tremendously thrilling and an extraordinary danger.

The sentence 'Big wave surfing is supposed to be both tremendously thrilling and an extraordinary danger.' is wrong because the tense and form of the first modifier "tremendously thrilling" is different from "extraordinary danger" and thus the sentence is not parallel because they do not follow the same form.

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sortingsteering sortingsteering · Answer 2 · 2019-06-19T17:15:23+02:00

Answer: D) Big wave surfing is supposed to be both tremendously thrilling and an extraordinary danger.

Explanation: parallelism or parallel structure is a literary device that consists in the repetition of the grammatical structure of different words or phrases in a sentence or paragraph, in order to emphasize an idea or to create an impact in the audience. From the given options, the sentence that is not parallel, is the corresponding to option D, because the structures "tremendously thrilling" and "extraordinary danger" are not similar.