Which of the following correctly distinguishes between an Arrhenius acid and base? Choose 1 answer: (A) An acid produces $$ \mathrm{H}^{+} $$in water, while a base produces $$ \mathrm{OH}^{-} $$. (B) An acid produces $$ \mathrm{OH}^{-} $$in water, while a base produces $$ \mathrm{H}^{+} $$. (C) An acid produces $$ \mathrm{H}_{2} $$ gas in water, while a base produces $$ \mathrm{CO}_{2} $$.

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To distinguish between an Arrhenius acid and base, we can refer to the definitions provided by Svante Arrhenius:

- An **Arrhenius acid** is a substance that increases the concentration of $$ \mathrm{H}^{+} $$ ions (protons) in aqueous solution.
- An **Arrhenius base** is a substance that increases the concentration of $$ \mathrm{OH}^{-} $$ ions (hydroxide ions) in aqueous solution.

Now, let's analyze the options:

(A) An acid produces $$ \mathrm{H}^{+} $$ in water, while a base produces $$ \mathrm{OH}^{-} $$.  
This statement is correct according to the Arrhenius definitions.

(B) An acid produces $$ \mathrm{OH}^{-} $$ in water, while a base produces $$ \mathrm{H}^{+} $$.  
This statement is incorrect; it reverses the definitions.

(C) An acid produces $$ \mathrm{H}_{2} $$ gas in water, while a base produces $$ \mathrm{CO}_{2} $$.  
This statement is also incorrect; it does not reflect the definitions of Arrhenius acids and bases.

Thus, the correct answer is:

**(A) An acid produces $$ \mathrm{H}^{+} $$ in water, while a base produces $$ \mathrm{OH}^{-} $$.**
An acid produces $$ \mathrm{H}^{+} $$ in water, while a base produces $$ \mathrm{OH}^{-} $$.

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