Sentence Correction (SC) | The electronics company has unveiled what it claims to be the world’s

Hi Experts - I don't know the idiomatic nuances between 'claims to be' and 'claims is'. But can we call upon the stylistic preferences for this question to choose between option B and D ? i.e. stacked modifiers (not good) vs modifiers in parallel (preferred style) ?

Both options seemed to be grammatically correct to me when I first attempted the question.

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