During his stay in South Africa, Gandhiji published a newspaper called Indian Opinion. This newspaper served as a platform for him to spread his ideas and advocate for the rights of Indians in South Africa. Gandhiji used Indian Opinion to expose the injustices and discrimination faced by the Indian community and to mobilize support for their cause. The newspaper also provided a space for Indians to express their thoughts and concerns. Indian Opinion played a significant role in shaping Gandhiji`s philosophy of nonviolence and civil disobedience, which would later become the foundation of his movement for Indian independence. Therefore, the correct answer is option 2.