जी. स्टैनली हॉल ने कौन सी शिक्षण विधि को लोकप्रिय बनाया?

उत्तर: (C) प्रश्नावली विधि — G. Stanley Hall popularized the Questionnaire Method in education. He used questionnaires extensively in his research on child psychology and adolescence, making it a standard tool for educational res...