Which of the following statements is true for an amphoteric oxide ?

According to the NCERT textbook, metal oxides are generally basic in nature. However, some metal oxides, such as aluminium oxide ($\text{Al}_2\text{O}_3$) and zinc oxide ($\text{ZnO}$), show both acidic as well as basic behaviour. Such metal oxides which react with both acids as well as bases to produce salts and water are known as amphoteric oxides.

• Option (a) is incorrect because amphoteric oxides react with both acids and bases, and they do produce water.
• Option (b) is incorrect because the reaction of an amphoteric oxide with an acid or a base produces salt and water, not hydrogen gas.
• Option (c) is correct because it accurately defines the reaction of amphoteric oxides with both acids and bases to yield salt and water.
• Option (d) is incorrect because they react with acids as well as bases, and water is indeed formed.