The year 1956 saw the official migration of the International Police Organization due to the adoption of which formal document?

A.
constitution
B.
bill of rights
C.
operation manual
D.
declaration

A. constitution

The correct answer is D. declaration.

To find the answer to this question, we need to understand the context of the situation. The International Police Organization is also known as Interpol, an international organization that facilitates cooperation among police forces from different countries. The organization was officially formed in 1923.

Now, let's analyze the given options:

A. Constitution: A constitution is a formal document that establishes the basic principles, rights, and laws of an organization or country. While organizations and countries often have constitutions, it is unlikely that the migration of Interpol would be due to the adoption of a constitution.

B. Bill of Rights: A bill of rights is a formal document that outlines the fundamental rights and freedoms of individuals. While important, the adoption of a bill of rights would not be a specific reason for the migration of Interpol.

C. Operation Manual: An operation manual provides instructions and guidelines for the operation of an organization or system. While an operation manual might be relevant to the functioning of Interpol, it is not specifically related to the migration of the organization.

D. Declaration: A declaration is a formal announcement or statement of intent. While a declaration might be relevant for the establishment or change of certain policies, it is unlikely to be the reason for the migration of Interpol.

Based on the given options, none of them seem directly related to the migration of Interpol. Therefore, it is possible that the correct answer is not among the provided choices, or the question might be inaccurate.