Answer: B ) [tex]H_2O][/tex]
Explanation:- According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a substance which accepts protons.
Amphoteric substances are substances which can act as both acids and bases and thus can accept and donate [tex]H^+[/tex] ions.
[tex]H_2O\rightarrow H^++OH^_[/tex]
Here water acts as an acid as it donates [tex]H^+[/tex] ions.
[tex]H_2O+H^+\rightarrow H_3O^+[/tex]
Here water acts as a base as it accepts [tex]H^+[/tex] ions.
