Which satyagraha made M.K. Gandhi a 'truly national leader'?

Rowlatt Satyagraha

The correct answer is Option (4) → Rowlatt Satyagraha

" It was the Rowlatt satyagraha that made Gandhiji a truly national leader. Emboldened by its success, Gandhiji called for a campaign of “non-cooperation” with British rule. Indians who wished colonialism to end were asked to stop attending schools, colleges and law courts, and not pay taxes. In sum, they were asked to adhere to a “renunciation of (all) voluntary association with the (British) Government”. If non cooperation was effectively carried out, said Gandhiji, India would win swaraj within a year. To further broaden the struggle he had joined hands with the Khilafat Movement that sought to restore the Caliphate, a symbol of Pan-Islamism which had recently been abolished by the Turkish ruler Kemal Attaturk.".