Which is a base? a. substance c is formed from the reaction of an acid and a base. b. substance a gives off h+ ions that combine with oh– ions when dissolved in water. c. substance b gives off oh– ions that combine with h+ ions when dissolved in water.

C. Substance B gives off OH– ions that combine with H+ ions when dissolved in water.

Explanation:

A base is a substance that interacts with water to yield excess hydroxide ions in an aqueous solution.

Bases are certain metallic oxides, metallic hydroxides and aqueous ammonia.

Bases reacts with acids to produce salts which is substance C as described in first option.

Substance A is an acid and it gives off Hydrogen ion.

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explanation: