The Kothari Commission’s report was entitled :

Concept — An Indian education commission is referred to informally by the name of its chairperson, but the document it produces carries a formal published title, and that title is written to announce the commission’s central thesis. Answering a question of this kind therefore means pairing the chairperson’s name with the exact title under which that commission’s report appeared, and keeping national commissions distinct from international ones that address similar themes.

Application — Apply that rule to the commission named in the question:

1. The "Kothari Commission" is the informal name of the Education Commission (1964–66), chaired by Dr. Daulat Singh Kothari, who was then Chairman of the University Grants Commission.

2. It was the first Indian commission to survey the whole education system in one exercise — primary, secondary, vocational and higher education together — and it submitted its report to the Government of India on 29 June 1966.

3. Its central thesis was that education must be the principal instrument of the country’s economic and social growth, a claim captured in its best-known sentence: "The destiny of India is now being shaped in her classrooms."

4. That thesis is what the formal title announces, so the report was published as "Education and National Development" — and its recommendations (the 10+2+3 pattern, the common school system, and spending 6% of national income on education) were carried into the National Policy on Education, 1968.

Cross-check — Test the result against the other titles offered, each of which belongs to a different document or theme:

• "Learning to be adventure" echoes "Learning to Be", the 1972 report of the UNESCO commission chaired by Edgar Faure — an international document, published six years later, and unconnected with the Indian commission of 1964–66.

• "Diversification of Education" names a policy theme, the widening of study streams and vocational routes, and is not the title under which any Indian education commission published its report.

• "Education and socialization in democracy" states a sociological concern about preparing citizens for democratic life; it is a subject of academic writing rather than the title of the 1964–66 report.

Result: the report of the Kothari Commission was entitled "Education and National Development".