The correct option is D "Powerful you have become, the dark I see in you."
An effective way to make language more emphatic when using English is by
inverting a sentence's normal word order.
For example, "I have never
eaten such a flaky croissant" is a regular sentence, with the normal SVO word
order: subject (I) + verb (have never eaten) + object (such a flaky
croissant). To add emphasis, the auxiliary verb "have" can be placed before the subject: "Never have I eaten such a flaky croissant" ("Never" is an adverb and
the main verb is 'eaten')
The given sentence is of the normal word order (SVO) hence the sentence must be changed, and option A is incorrect.
Option D is correct. Here it is the object ("powerful" and "the dark") instead of the verb ("have become" and "see") is placed before the subject ("you" and "I"). It's not the same as the normal inversion, which is VSO. This language is famously used by Yoda, a character from the popular movie franchise, Star Wars. It's also used in archaic texts. Hence option D is correct.
Option B is incorrect as the meaning is incomprehensible. In inversion the meaning must be understood easily.
Option C is incorrect because the sentence form is that of a question. The meaning changes as it seems the speaker is seeking an answer.