Explanation:

- The ‘Instrument of Surrender’ ending Portuguese rule in India was indeed signed on 19th December 1961. On this day, Portuguese territories of Goa, Daman, and Diu were liberated by Indian forces, marking the end of Portuguese colonial rule in India.

- Option 2: 29th December 1951: This date has no relevance to the Portuguese rule in India. It doesn’t correspond to any significant event regarding Goa’s liberation.

- Option 3: 15th August 1947: This is the date when India gained independence from British rule, not relevant to Portuguese territories.

- Option 4: 26th January 1948: This is a significant date for India, as it marks the Republic Day celebrations, but it’s unrelated to the end of Portuguese rule.