The correct option is A Constitutional body
The Election Commission of India is a permanent Constitutional Body because it was established in accordance with the Constitution on 25th January 1950. The Constitution of India has vested in the Election Commission of India the superintendence, direction and control of the entire process for conduct of elections to Parliament and Legislature of every State and to the offices of President and Vice-President of India, thus making it permanent for the functioning of democracy. Hence, Option A is correct. The rest of the bodies are not formed permanently in accordance with the Constitution and can be dissolved anytime, hence, incorrect.