Correct Answer: Option D

Explanation

The correct answer is D - Reaction between an anhydride and water.

This is a general method of preparing acids, where an anhydride (a compound that lacks water) reacts with water to form an acid. For example:

                          SO\(_3\) + H\(_2\)O → H\(_2\)SO\(_4\)

                          CO\(_2\) + H\(_2\)O → H\(_2\)CO\(_3\)

This method is commonly used to prepare various types of acids, including inorganic acids like sulfuric acid, nitric acid, and phosphoric acid.

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