Concept:The Constituent Assembly was formed based on the Cabinet Mission Plan of 1946, which provided a framework for drafting India’s constitution.
Explanation:The idea of a Constituent Assembly was first proposed by M. N. Roy in 1934.
The Cabinet Mission Plan, 1946, directly led to the establishment of the Constituent Assembly in November 1946.
Members were elected by the provincial assemblies using the single transferable vote system (proportional representation).
Initially, the Assembly had 389 members. After Partition, 299 members remained — 229 from British provinces and 70 from princely states.
Dr. Sachchidananda Sinha served as the first interim chairman. Later, Dr. Rajendra Prasad became president and Harendra Coomar Mookerjee became vice president. B. N. Rau was the constitutional adviser.
The Assembly’s task was to draft a constitution for an independent India.
Answer:The correct option is D: under the Cabinet Mission Plan, 1946.