फिंगरप्रिंट या भौतिक अवशेषों जैसे पुरावशेषों को मुख्य रूप से निम्नलिखित में से किस अनुसंधान पद्धति में विश्वसनीय प्राथमिक साक्ष्य माना 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?