Explanation:

Out of the mentioned organizations/bodies, only "The National Commission for Backward Classes" is a constitutional body. It was given constitutional status by the 102nd Constitutional Amendment Act, 2018.

The National Human Rights Commission (NHRC) is a statutory body, established by the Protection of Human Rights Act, 1993.

There is no "National Law Commission" in India. The correct reference might be to the Law Commission of India, which is neither a constitutional nor a statutory body. Instead, it's an executive body formed periodically by the Government of India.

The National Consumer Disputes Redressal Commission (NCDRC) is a statutory body set up under the Consumer Protection Act of 1986.

Hence, only one of them, i.e., The National Commission for Backward Classes, is a constitutional body