For the reaction $NH_4^+ + S^{2-} \rightleftharpoons NH_3 + HS^-$,identify the nature of $NH_3$ and $HS^-$ in the context of the Brønsted-Lowry theory.

  • A
    Acids
  • B
    Bases
  • C
    Conjugate acid-base pair
  • D
    None of these

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