The correct answer is option 2 - Cabinet Mission Plan.

The Constituent Assembly of India was not created under the Cripps proposals (option 1). The Cripps proposals were a set of constitutional proposals put forward by Sir Stafford Cripps in 1942, but they did not lead to the creation of the Constituent Assembly.

The Constituent Assembly was also not created under the Simla Agreement (option 3). The Simla Agreement was an agreement between India and Pakistan in 1972 to resolve the conflict in East Pakistan, which led to the creation of Bangladesh. It is unrelated to the creation of the Constituent Assembly.

Similarly, the Constituent Assembly was not created under Mountbatten Recommendations (option 4). Lord Mountbatten was the last Viceroy of India, and he made certain recommendations for the future of India, but these recommendations did not lead to the creation of the Constituent Assembly.

Therefore, the correct answer is option 2 - Cabinet Mission Plan. The Cabinet Mission Plan was a plan proposed by the British government in 1946, which led to the creation of the Constituent Assembly of India. The Constituent Assembly was tasked with drafting a constitution for independent India.