What was the exact constitutional status of India on 26th January, 1950?

Option (B) is correct because the original Preamble, as adopted on 26th January 1950, defined India specifically as a "Sovereign Democratic Republic." Option (D) is a common misconception as it reflects India's current status; however, the terms "Socialist" and "Secular" were only inserted later by the 42nd Constitutional Amendment Act of 1976. The core concept being tested is the historical evolution of the Preamble and the specific changes made to the Constitution over time.