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Answer is C. 7/12 has the reciprocal of 12/7. When You multiply by a reciprocal, you just switch the numerator and denominator. The answer does NOT become negative. It would change the fraction itself.
Example:
3/6= 6/3
5/7= 7/5
The reciprocal of 7/12  is 12/7. In fractions you flop the fractions.  So your answer would  C   12/7.  Hope this helps