In which year, did the ‘Indian Education Commission’ (The sixth commission in the history of Indian Education) under the chairmanship of Dr. D S. Kothari submit its report?

The correct option is 1966.

Detailed Explanation:
The Indian Education Commission, popularly known as the Kothari Commission, was set up by the Government of India on July 14, 1964, under the chairmanship of Dr. Daulat Singh Kothari (D. S. Kothari), who was the then chairman of the University Grants Commission (UGC).
The commission was tasked with formulating a coherent and comprehensive national policy on education to advise the government on the national pattern of education and on the general principles and policies for the development of education at all stages.

The commission thoroughly examined various aspects of the education system in India. After extensive evaluations, consultations, and research, it finalized its comprehensive report, titled "Education and National Development". This historic report was submitted to the government on June 29, 1966.