The correct order of leaving group ability is:

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C F_{3} S O_{3}^{-} > C C l_{3} S O_{3}^{-}

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B r^{-} > I^{-}

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N H_{3} > O H^{-}

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Solution

The correct options are
B $C F_{3} S O_{3}^{-} > C C l_{3} S O_{3}^{-}$
D $N H_{3} > O H^{-}$
Triflate is amongst one of the best leaving groups because of the stability of anion formed is extremely stable. Since the conjugate base is very stable, the corresponding acid is a superacid, even stronger than pure sulfuric acid. Since the conjugate base is super stable, the leaving group ability is higher. A similar interpretation also works for $N H_{3}$ and $O H^{-}$ also.
Leaving group ability $\propto$ strength of conjugate base

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