दिए गए विकल्पों में से उस सही संख्या का चयन कीजिए जो निम्नलिखित आव्यूह (matrix) में प्रश्नवाचक चिह्न (?) को प्रतिस्थापित करेगी: 8 128 2 4 1 64 ? 32 256

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?