The correct answer is “civil”.
Mohandas Gandhi advocated civil disobedience.
On March 12, 1930, Mohandas Gandhi who was the leader of the Indian Independence, began a march to protest for the English monopoly of salt in India. This started the civil disobedience against the British monarchy. The situation was that the British Acts did not allow Indians from collecting salt that was very important for its nutrition. They had to buy it for the English.
The other options of the question were, a) religious, c) military, and d) social.