Chronological Order of Events:

I. Vaikom
II. Borsad
III. Kheda
IV. Champaran

Explanation:

I. Vaikom:
Vaikom Satyagraha was a movement that took place in 1924-25 in the princely state of Travancore (now part of Kerala, India). The movement aimed to secure the right of access for all castes to the public roads surrounding the famous Vaikom Mahadeva Temple. It was led by social reformer T.K. Madhavan, and it played a significant role in the temple entry movement in India.

II. Borsad:
Borsad Satyagraha was a significant event that occurred in 1923 in Borsad, a town in the eastern part of Gujarat, India. The movement was led by Vallabhbhai Patel, who later became the first Deputy Prime Minister and first Minister of Home Affairs of independent India. The satyagraha was organized to support the peasants who were facing severe economic exploitation by the British government and the local landlords.

III. Kheda:
Kheda Satyagraha was a nonviolent protest organized by Mohandas Karamchand Gandhi (Mahatma Gandhi) in 1918 in the Kheda district of Gujarat, India. The movement aimed to oppose the British government's decision to impose heavy taxes on farmers even though they had suffered crop failures due to floods. The satyagraha highlighted the issues faced by the peasants and their inability to pay the taxes, leading to a successful negotiation with the British authorities.

IV. Champaran:
Champaran Satyagraha, also known as the Champaran movement, was one of the earliest struggles led by Mahatma Gandhi in India. It took place in the Champaran district of Bihar in 1917. The movement was initiated to address the grievances of indigo farmers who were forced to cultivate indigo by British planters. Gandhi's involvement in the satyagraha brought attention to the exploitation faced by the farmers and eventually led to reforms in the agricultural system.

Chronological Order:
Based on the given information, the correct chronological order of the events is as follows:

c) I, II, IV, III
- Vaikom
- Borsad
- Champaran
- Kheda