With reference to Indian Polity, which one of the following statements is correct?

Statement B is correct because under Article 123 of the Indian Constitution, the President has the power to promulgate ordinances only when either of the two Houses of Parliament is not in session. Since an ordinance has the same force as an act of Parliament, it cannot be issued if both Houses are sitting, as the regular legislative process must be followed in that case.

Regarding the other options: The Planning Commission was an advisory body replaced by NITI Aayog and was not directly accountable to Parliament. There is no minimum age prescribed for the appointment of a Supreme Court Judge in the Constitution. The National Development Council includes the Prime Minister, all Union Cabinet Ministers, Chief Ministers of all States and Union Territories, and members of the Planning Commission, making option D incomplete.