Which of these is not an achievement under the colonial rule?

It is difficult to definitively say that "none" of these options is not an achievement under colonial rule, as each could be considered an achievement in certain respects. However, if we consider the impact of colonial rule on Nigeria as a whole, one could argue that the creation of political regions is not necessarily an achievement. While the creation of political regions did establish a more organized and efficient system of governance, it also perpetuated divisions between different ethnic and cultural groups within Nigeria. This ultimately contributed to conflicts and tensions that have persisted long after the end of colonial rule. On the other hand, the creation of the Nigerian Council and the issuance of proclamations were both significant achievements under colonial rule. The Nigerian Council represented a step towards self-government and greater autonomy for Nigeria, while proclamations helped to establish legal frameworks and regulations that would ultimately shape the country's political, economic, and social systems.