The correct answer is: C. For some specific purpose.
An investigation is a process of inquiry into a matter. It can be conducted for a variety of purposes, such as to determine the truth of a matter, to establish responsibility for an event, or to recommend corrective action. Investigations can be conducted by individuals, groups, or organizations. They can be formal or informal, and they can be conducted in a variety of ways.
Option A is incorrect because an investigation is not always a good inquiry. An investigation may be conducted for a variety of purposes, some of which may not be good.
Option B is incorrect because an investigation is not always conducted to establish the correctness of the accounting records. An investigation may be conducted for a variety of purposes, some of which may not involve the accounting records.
Option D is incorrect because an investigation is not always a constitutional requirement. An investigation may be conducted voluntarily or by law.
In conclusion, the correct answer is: C. For some specific purpose.