Correct Answer: (a) Use of passive resistance to achieve Indian Independence.
Note: Struggle done by Gandhi in South Africa was termed as 'Inactive resistance' but later Gandhi chose the word 'Satyagraha' in place of inactive resistance. Satyagraha was the term, which was used most during the freedom struggle. But Gandhi differentiated between Satyagraha and inactive resistance. As per him, inactive resistance is a political tool, whereas Satyagraha is moral power. He differentiated Inactive Resistance and Satyagraha by comparing it with the north and the south pole.