Correct Option
The Champaran Satyagraha (1917) was initiated by Mahatma Gandhi to address the grievances of indigo cultivators. Rajendra Prasad was among the prominent leaders who actively assisted Mahatma Gandhi in this movement, alongside J.B. Kripalani, Mahadev Desai, and Narhari Parikh. Thus, pair 1 is correctly matched.
The Kheda Satyagraha (1918) was a peasant movement against the British government's decision to collect full land revenue despite crop failure. Mahatma Gandhi, along with Sardar Vallabhbhai Patel, played a crucial role in leading this satyagraha. Thus, pair 3 is correctly matched.
Incorrect Options
The Ahmedabad Mill Strike (1918) was led by Mahatma Gandhi. This movement involved textile mill workers demanding a 35% wage increase. Mahatma Gandhi undertook his first fast unto death in India during this strike to support the workers' demands. Morarji Desai was not associated with this specific movement. Therefore, pair 2 is incorrectly matched.
Options (a), (b), and (d) are incorrect as they include pair 2, which is falsely matched. Only pairs 1 and 3 are correctly matched.