Which of the following contributed greatly to the introduction of the Clifford Constitution?

The National Congress of British West Africa contributed greatly to the introduction of the Clifford Constitution. The constitution was introduced in 1922 by Governor Hugh Clifford during the colonial era in Nigeria. It replaced the 1914 amalgamation order and established the principle of direct and indirect election. The National Congress of British West Africa was a political organization that advocated for reforms in the British colonies in West Africa, including Nigeria. The organization was instrumental in raising awareness of the need for political representation and greater autonomy in British West Africa. Its efforts eventually led to the introduction of the Clifford Constitution, which marked an important step towards self-government in Nigeria.