Correct Answer: Planning Commission of India

Solution : The correct answer is (c) Planning Commission of India.

The estimation of the poverty line in India has historically been the responsibility of the Planning Commission of India, which was a government body responsible for formulating and assessing the country's Five-Year Plans. The Planning Commission, now replaced by NITI Aayog, has used various methods and criteria to determine the poverty line in India.

It is important to note that the specific methodology for estimating the poverty line in India has undergone revisions and updates over time. Different committees and experts have been involved in reviewing and recommending changes to the methodology. However, the Planning Commission (now NITI Aayog) has been the primary institution responsible for estimating the poverty line in India.