OE:
Choice (A) illogically suggests that osmium itself, the very existence of the element itself, is "due to a pattern of density among the elements". Furthermore, the final three words of (A) are a disaster --- "they call it" ---- (a) who is "they"? This pronoun has no antecedent in the sentence; (b) the antecedent of "it" is grammatically ambiguous --- it could be osmium, or the pattern, or the distinction. (A) is incorrect.
Choice (B) uses the emphatic
...
Choice (A) illogically suggests that osmium itself, the very existence of the element itself, is "due to a pattern of density among the elements". Furthermore, the final three words of (A) are a disaster --- "they call it" ---- (a) who is "they"? This pronoun has no antecedent in the sentence; (b) the antecedent of "it" is grammatically ambiguous --- it could be osmium, or the pattern, or the distinction. (A) is incorrect.
Choice (B) uses the emphatic
...
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