Correct Option: B. 1957 Detailed Explanation: The question asks about the year when the Eastern and Western regions of Nigeria achieved the status of self-government. To understand this, we need to look at the historical context of Nigeria's path to self-governance.

1. Historical Background:
2. Nigeria was a British colony until the mid-20th century. The push for self-governance began in the 1940s and 1950s as nationalist movements gained momentum.
3. The British colonial government introduced various constitutional reforms to gradually increase local governance.
4. The 1954 Lyttleton Constitution:
5. The Lyttleton Constitution was a significant step towards self-governance. It established a federal system of government and allowed for regional autonomy.
6. This constitution laid the groundwork for the regions to have their own governments, which was a crucial step towards self-governance.
7. Self-Government Achievements:
8. The Eastern and Western regions were granted self-government in 1954, but it was not until 1957 that they fully achieved this status with more powers and responsibilities.
9. In 1957, the Eastern and Western regions were able to elect their own premiers and have more control over their local affairs, marking a significant milestone in Nigeria's journey towards independence.
10. Independence Timeline:
11. Following the self-government status in 1957, Nigeria eventually gained full independence from British rule on October 1, 1960. This timeline is crucial for understanding the gradual process of self-governance.

Why Other Options Are Incorrect:

• Option A: 1959:
• This year is significant as it was close to Nigeria's independence, but it does not mark the achievement of self-government for the Eastern and Western regions. By 1959, the regions were already functioning under self-governance established in 1957.
• Option C: 1950:
• This year is too early in the timeline. The constitutional reforms that led to self-governance were not yet in place. The Lyttleton Constitution, which was crucial for regional self-governance, was introduced later in 1954.
• Option D: 1955:
• While 1955 was a year of political activity and discussions about self-governance, it was not the year when the Eastern and Western regions achieved that status. The actual granting of self-government occurred in 1957.

Revision Summary:

• The Eastern and Western regions of Nigeria achieved self-government in 1957.
• The Lyttleton Constitution of 1954 was a key step towards regional autonomy.
• Self-governance allowed regions to elect their own leaders and manage local affairs.
• Nigeria gained full independence from British rule in 1960, following the self-governance milestone.