20 ऑगस्ट 1947 च्या नवशक्तीत प्रबोधनकार ठाकरे लिहीतात "राज्याभिषेकाच्यावेळी शिवाजीने फडकवलेला झेंडा ________.

The correct answer is Option A (very simple with no marks).

Key Points:
• Keshav Sitaram Thakare (Prabodhankar Thakare, 1885–1973): A prominent social reformer, historian, and leader of the Non-Brahmin and Samyukta Maharashtra movements.
• Article in 'Navshakti' (20 August 1947): Writing immediately following India's Independence, Prabodhankar analyzed the historical symbolism of Chhatrapati Shivaji Maharaj's royal standard.
• Bhagwa Zenda (The Saffron Flag): He clarified that at the time of the grand coronation (Rajyabhisheka) in 1674, Shivaji Maharaj hoisted a plain saffron swallow-tailed banner (*Bhagwa Zenda*) that was completely plain and bore no marks, letters, or emblems.
• Ideological Context: He emphasized the inclusive, non-sectarian character of Shivaji Maharaj's sovereign Swarajya.
• Key Historical Fact: The coronation flag was plain without any signs or marks.
• Key Takeaway: Prabodhankar Thakare stated in 'Navshakti' (1947) that Shivaji Maharaj's coronation flag was plain with no marks.