Name the political leader who came to be known as "Frontier Gandhi".

Abdul Ghaffar Khan

The correct answer is Option (2) → Abdul Ghaffar Khan

Abdul Ghaffar Khan, also known as Bacha Khan, earned the title 'Frontier Gandhi' due to his nonviolent and Gandhian approach to the Indian independence movement, which was inspired by Mahatma Gandhi. He was a prominent leader in the Indian freedom struggle and was known for his commitment to nonviolence and social reform, similar to Mahatma Gandhi. His work in the North-West Frontier Province (now Khyber Pakhtunkhwa in Pakistan) and his efforts to mobilize the local population for civil disobedience and nonviolent protest earned him the nickname 'Frontier Gandhi' as a tribute to his adherence to Gandhian principles in a challenging and often turbulent region.

So, the correct option is [2].