Correct Option: D. The breakup of its leadership. Detailed Explanation: The Nigerian Youth Movement (NYM) was a significant political organization in Nigeria during the early 20th century, particularly in the 1940s. It was formed to advocate for the rights and interests of Nigerian youth and to push for political reforms. However, the movement eventually collapsed, and one of the primary reasons for this was the breakup of its leadership.

1. Leadership Fragmentation: The NYM was initially united under a common goal, but as time progressed, internal divisions began to emerge. Different factions within the leadership had varying visions for the movement's future, leading to conflicts and a lack of cohesive direction. This fragmentation weakened the organization’s ability to present a united front, which is crucial for any political movement.
2. Ideological Differences: The leaders of the NYM had differing ideologies and strategies for achieving their goals. Some members favored a more radical approach, while others preferred gradual reform. These ideological rifts made it difficult to maintain unity and focus, ultimately leading to the disintegration of the movement.
3. Loss of Influence: As the leadership became more divided, the movement lost its influence among the youth and the broader population. A united leadership is essential for rallying support and mobilizing members. The inability to maintain a strong, cohesive leadership structure meant that the NYM could not effectively advocate for its objectives or respond to the political landscape.
4. Impact of External Factors: While external pressures, such as government harassment (option C), did play a role in the challenges faced by the NYM, the internal issues stemming from leadership breakdown were more critical to its collapse. A strong leadership can often withstand external pressures, but when internal unity is lacking, the organization becomes vulnerable.

Why Other Options Are Weaker:

• A. Its failure to win election: While electoral success is important for any political movement, the NYM's collapse was more fundamentally tied to internal divisions rather than just electoral failures. The movement had other avenues for influence and advocacy beyond elections, and its inability to win elections was a symptom of deeper issues rather than the primary cause of its collapse.
• B. Shortage of funds to run its affairs: Financial issues can certainly hinder an organization, but the NYM's primary problem was not merely a lack of funds. Many political movements face financial challenges but can still thrive if they have strong leadership and a clear vision. The breakup of leadership led to a loss of direction and purpose, which is more critical than financial constraints.
• C. The harassment of its leadership by government: Government harassment can weaken a movement, but it is often the response and resilience of the leadership that determines the outcome. In the case of the NYM, the internal conflicts and fragmentation were more detrimental than external pressures. A united leadership could have potentially navigated government challenges more effectively.

Revision Summary:

• The Nigerian Youth Movement collapsed primarily due to the breakup of its leadership, leading to internal divisions and loss of direction.
• Fragmentation of leadership resulted in ideological differences and weakened the movement's influence.
• While external factors like government harassment and financial issues were present, they were not the main causes of the collapse.
• A strong, united leadership is crucial for the success and sustainability of any political movement.