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Suman Kumar Best Answer
Acidic strength of any compound is compared by the stability of the anion formed after releasing the proton. H2SO4 = HSO4- + H+ HSO4- is the anion which is also called conjugate base. Stability of the anion is affected by various factor such as size of anion , eletronegativity, resonance etc. Size of anion is dominant factor. Now coming to your question S- is most stable followed by O- and then NH-. S being larger in size is most acidic and O- is more eletronegativity than NH- Hence is your answer of acidic strength order C>A>B