Verified Answer :

9/-12 is an obvious answer to eliminate as the numerator is not negative and the denominator is not positive. -15/20 simplified is -3/4, so you have to find a similar fraction. This means that D and A are eliminate and leaves you with C as the answer.

It's C and possibly B because 15=3×5 and 20=4×5 so simplifying it we get -3/4 with is equals (not equavilent (though this is revelant only in few casses such as programing)) with 3/-4. In case of C we multiply both numbers with 4.
-3×4/4×4=(-12)/16. for B we multiply by 3.
3×3/-4×3=9/-12

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