निम्नलिखित चार विकल्पों में से तीन एक निश्चित तरीके से समान हैं और एक समूह बनाते हैं। वह कौन सा है जो उस समूह से संबंधित नहीं है?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?