Gandhi's fight in Champaran signifies the power of effective leadership. It was a significant event in the early life of Mahatma Gandhi and played a crucial role in shaping his philosophy and approach to nonviolent resistance. Here is a detailed explanation of why the answer is option 'A':

1. Background:
- The fight in Champaran took place in 1917 in the Champaran district of Bihar, India.
- The farmers in the region were forced to cultivate indigo by the British indigo planters, leading to exploitation and distress.
- The farmers were compelled to grow indigo on a portion of their land, known as the tinkathia system, and were paid very low wages for their labor.

2. Gandhi's Involvement:
- Gandhi, who had recently returned to India from South Africa, was requested by Rajkumar Shukla, a poor farmer from Champaran, to intervene in the situation.
- Despite being initially hesitant, Gandhi eventually agreed to visit Champaran and understand the farmers' grievances.

3. Leadership Approach:
- Gandhi employed a unique leadership approach during his fight in Champaran, which demonstrated the power of effective leadership.
- He actively listened to the concerns of the farmers and empathized with their struggles.
- Gandhi organized meetings and discussions with the local community to understand the depth of the problem.
- He encouraged the farmers to share their experiences and unite against the unjust practices of the indigo planters.

4. Mobilization and Advocacy:
- Gandhi mobilized the local farmers and organized protests and strikes against the indigo planters.
- He educated the farmers about their rights and encouraged them to resist the exploitation.
- Gandhi's ability to communicate effectively and inspire the farmers to fight for their rights showcased his leadership skills.

5. Negotiation and Resolution:
- Gandhi led negotiations with the British authorities and the indigo planters to address the farmers' concerns.
- Through his persuasive approach and nonviolent resistance, Gandhi was able to secure significant concessions for the farmers.
- The tinkathia system was abolished, and the farmers were given the freedom to choose their crops.

6. Impact and Significance:
- Gandhi's successful fight in Champaran marked a turning point in his life and the Indian independence movement.
- It demonstrated the power of effective leadership in mobilizing communities, advocating for justice, and achieving positive change.
- The event also solidified Gandhi's commitment to nonviolent resistance and his belief in the power of grassroots movements.

In conclusion, Gandhi's fight in Champaran signifies the power of effective leadership because of his ability to mobilize and empower the local farmers, advocate for their rights, negotiate with the authorities, and ultimately bring about positive change. His approach showcased the transformative potential of effective leadership in challenging unjust systems and inspiring others to join the struggle for justice.