मुद्रित पाठ्य-सामग्री का उपयोग किए बिना मुख्य रूप से प्रासंगिक जोखिम के माध्यम से दूसरी भाषा सीखने में निम्नलिखित में से कौन-सा उपागम/विधि सहायता करती 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?