निम्नलिखित में से किसे यायावर (घुमंतू) जीवन से प्रारंभिक बसे हुए गांवों में परिवर्तन के लिए मूलभूत कारक के रूप में पहचाना जाता 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?