Consider the following statements: 1. The highest deciding body for planning in India is the Planning Commission of India. 2. The Secretary of the Planning Commission of India is also the Secretary of National Development Council. 3. The Constitution includes economic and social planning in the Concurrent List in the Seventh Schedule of the Constitution of India. Which of the statements given above is/are correct?

The correct answer is D because only statement 3 is accurate.

Let's analyze each statement:

1. The highest deciding body for planning in India is the Planning Commission of India. This statement is incorrect. The Planning Commission was an advisory body responsible for formulating plans. The highest approving body for Five Year Plans was the National Development Council (NDC). Moreover, the Planning Commission itself was abolished in 2015 and replaced by NITI Aayog.

2. The Secretary of the Planning Commission of India is also the Secretary of National Development Council. This statement is incorrect in the current context. The Planning Commission no longer exists. Historically, when the Planning Commission was operational, its Secretary did indeed serve as the Secretary of the National Development Council. However, given the current institutional framework, this statement is outdated.

3. The Constitution includes economic and social planning in the Concurrent List in the Seventh Schedule of the Constitution of India. This statement is correct. Entry 20 of the Concurrent List (List III) of the Seventh Schedule explicitly mentions "Economic and social planning." This means both the Union and State governments can legislate on this subject.

Since only statement 3 is correct, option D is the correct answer.