The correct option is C 5521
First, let's convert the fraction 323 into an improper fraction.
323=(3×3)+23=9+23=113
The equivalent fractions of 113 can be:
11×23×2=22611×33×3=33911×43×4=441211×53×5=5515
So,5521 is the only option which is not equivalent to 323.