निम्नलिखित में से किसने मुख्य रूप से राजनीति विज्ञान और सामाजिक विज्ञान में व्यवस्था विश्लेषण (systems analysis) दृष्टिकोण की शुरुआत की थी?

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?