(D) According to the Bronsted-Lowry theory,an acid is a proton $(H^+)$ donor and a base is a proton acceptor.In the reaction $NH_3 + H_2O \to NH_4^+ +

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(D) According to the Bronsted-Lowry theory,an acid is a proton $(H^+)$ donor and a base is a proton acceptor.In the reaction $NH_3 + H_2O \to NH_4^+ + OH^-$,$H_2O$ donates a proton to $NH_3$ to form $NH_4^+$ and $OH^-$.Since $H_2O$ acts as a proton donor,it is the acid in this reaction.