(a) MK Gandhi took the leadership of the National Movement (Khilafat Movement) in 1919-20. Hence, option (a) is the correct answer. Mahatma Gandhi arrived India in 1915 from South Africa. At first, he spent a year exploring different places in India to understand the situation. Mahatma Gandhi's political activity began in the period of 1917-18, when he dealt with the issues of the Champaran Indigo Farmers (1917), the Ahmedabad Textile Workers (1918) and the Kheda Peasants (1918).