Explanation:
When an acid loses a H^+ the remaining specie is known as conjugate base according to Bronsted Lowry definition of acid and base
As per the lowry definition of the acid and base, the acid should become the conjugate base.
A conjugate acid, that lies within the Brønsted–Lowry acid–base theory,refers to the chemical compound that should be created at the time when an acid donates a proton to a bases.
In other words, it is a base with a hydrogen ion added to it, since it should be in the reverse reaction due to this, it loses a hydrogen ion. Therefore, the last option is correct.
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