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3- replace AMONG with BETWEEN, as the former is used when referring to more than two things, while the latter is used to refer to only two things. Here, only two years 2004 and 2012 are being discussed, so BETWEEN would be more suitable. 4 - remove either THOUGH or BUT from the sentence, as the usage of both is redundant. Both THOUGH and BUT are used to show contradiction. Only 1 and 2 are grammatically correct, which makes (a) the right answer.