On 20 July 2021, the Supreme Court struck down certain provisions of part IX B of the Constitution of India. Part IX B was related to:

Correct option is C

The correct answer is (c) Co-operative Societies.
 On July 20, 2021, the Supreme Court of India struck down certain provisions of Part IX B of the Constitution of India, which dealt with the formation, structure, and functioning of multi-state cooperative societies.
 This part, introduced by the 97th Constitutional Amendment Act, 2011, dealt specifically with Co-operative Societies.
 This judgment was in response to petitions challenging the constitutionality of Part IX B, which had been added through the 97th Constitutional Amendment Act of 2011.
 Panchayats are village-level self-governing bodies, and their functioning is governed by Part XI of the Constitution.