With reference to the Constituent Assembly, which of the following statements is correct?

The Constituent Assembly adopted the National Anthem in January 1950.

The correct answer is Option2 - The Constituent Assembly adopted the National Anthem in January 1950.

The other statements are incorrect:

The Constituent Assembly did not ratify India's membership of the Commonwealth; this decision was made separately by India's provisional government in May 1949.
The Constituent Assembly adopted the National Song, "Vande Mataram," on January 24, 1950.
The Constituent Assembly adopted the National Flag on July 22, 1947.