Arrange the following events in chronological order:
A) Ahmedabad satyagraha.
B) Champaran satyagraha.
C) Direct Action Day.
D) Rowlatt act.

B-A-D-C

The correct answer is Option 3 - B-A-D-C

Correct chronological order is:

B) Champaran satyagraha, 1917 - The Champaran Satyagraha was the first satyagraha (non-violent protest) campaign led by Mahatma Gandhi in India. It took place in the Champaran district of Bihar.

A) Ahmedabad satyagraha, 1918 - The Ahmedabad Satyagraha was a labor dispute led by Mahatma Gandhi in Ahmedabad, Gujarat. 

D) Rowlatt Act, 1919 - The Rowlatt Act was legislation passed by the British government in India to extend wartime emergency measures into peacetime.

C) Direct Action Day, 1946 - Direct Action Day, also known as the Great Calcutta Killings, occurred on August 16, 1946. It was called by the Muslim League to demand the creation of Pakistan.