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generis
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IMO (A) is the answer.

The price of gasoline saw more fluctuations between 2000 and 2010 than in any previous ten-year period.

A) saw more fluctuations between 2000 and 2010 than in any previous - the sentence is grammatically correct here and the tense is correct.

B) saw more fluctuations between 2000 and 2010 than they did in any previous - 'they' is ideally not required here. Especially considering the fact that gasoline is not a person.

C) saw more fluctuations between 2000 and 2010 than what it did in any previous - 'what' is just making no sense here.

D) fluctuated more between 2000 and 2010 than in any - 'any' can refer to any 10 year period; whether it be past or future.

E) fluctuated more between 2000 and 2010 than they did in any - same as D.
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In a parallel universe (A) is wrong for "the prices" can not "see" anything by themselves. But, I found some articles online where prices indeed can see fluctuations. P.S. Learned something new today.

But, the second closest choice (D) does not make a lot of sense either as the phrase "any other decade" also encompasses the decade from 2000-2010.
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The price of gasoline saw more fluctuations between 2000 and 2010 than in any previous ten-year period.

A) saw more fluctuations between 2000 and 2010 than (it did) in any previous

B) saw more fluctuations between 2000 and 2010 than they did in any previous

C) saw more fluctuations between 2000 and 2010 than what it did in any previous

D) fluctuated more between 2000 and 2010 than in any "previous" is missing

E) fluctuated more between 2000 and 2010 than they did in any
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I selected option A as answer but can’t figure out a clear reason why C is wrong. ‘It’ refers back to price and ‘did’ refers back to saw. Right?

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