In which year did the first Backward Classes Commission headed by Kaka Kalelkar submit its report?

The correct option is 1956.

Historical Context and Background:
The first Backward Classes Commission of India was established on January 29, 1953, under the chairmanship of Kaka Kalelkar, in accordance with Article 340 of the Constitution of India. The commission's mandate was to identify and determine the criteria for defining socially and educationally backward classes and to make recommendations for their advancement.

Timeline of the Commission’s Report:
1. Initial Submission: The Commission completed its comprehensive study and submitted its report to the President of India on March 30, 1955.
2. Official Presentation in Parliament: The report, along with the government's memorandum of action taken, was officially presented and tabled in both Houses of Parliament on September 3, 1956.

Because the official parliamentary tabling and public release of the report occurred in 1956, this year is widely recognized in administrative and academic records, making 1956 the correct answer.