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Passage context: 'Scientists have long known that soot particles facilitate melting by darkening snow and ice, limiting IT'S ability to reflect the Sun's rays.' Which choice best replaces the underlined portion?

ANO CHANGE (it's)
Bits
Cthere
Dtheir
Answer & Solution
Correct answer: B. its
Choice B (its) is correct. 'Its' is the possessive pronoun (snow and ice's ability). 'It's' is a contraction of 'it is' and is wrong here; 'there' is a location adverb; 'their' would refer to plural antecedents but the snow-and-ice pair is being treated collectively.
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