A series of 'Praja Mandals' were established to promote the nationalist creed among:

Princely States

The correct answer is Option (2) → Princely States

While Mahatma Gandhi’s mass appeal was undoubtedly genuine – and in the context of Indian politics, without precedent – it must also be stressed that his success in broadening the basis of nationalism was based on careful organisation. New branches of the Congress were set up in various parts of India. A series of “Praja Mandals” were established to promote the nationalist creed in the princely states. Gandhiji encouraged the communication of the nationalist message in the mother tongue, rather than in the language of the rulers, English. Thus the provincial committees of the Congress were based on linguistic regions, rather than on the artificial boundaries of British India. In these different ways nationalism was taken to the farthest corners of the country and embraced by social groups previously untouched by it.