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Answer
C
Explanation
According to the Bronsted-Lowry definition, an acid is a substance that can donate a proton (H+ ion), and a base is a substance that can accept a proton. A conjugate acid-base pair consists of two substances that differ only by a single proton. When an acid donates a proton, it becomes its conjugate base. Conversely, when a base accepts a proton, it becomes its conjugate acid. Therefore, the correct answer is that a conjugate acid-base pair is when two substances differ only by a single proton.
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