Sentence Correction (SC) | Two-thirds the students voted to visit the zoo

about C- I think it's worng because you have "since" and than "so"- Its wrong.
since they voted to the zoo,so the class went to the zoo

D changes the sentence and makes no sense. more than 2/3 - the sentence didnt say more....and more than 2/3 and another 1/3 is over 1...cant be
I answered A and was wrong,
I want to know the difference between another and other, maybe A should have said "the
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