The correct answer is: a) A meeting of all adult members of a village.
The Gram Sabha is a meeting of all adult members of a village. It is the highest decision-making body in the village and is responsible for all matters relating to the village. The Gram Sabha is convened by the Sarpanch, who is the elected head of the village. The Gram Sabha is open to all adult members of the village, and any member can participate in the discussions and vote on the decisions. The Gram Sabha is an important institution in the village, and it plays a vital role in the development of the village.
Option b) is incorrect because the executive body of a Gram Panchayat is called the Panchayat Samiti. The Panchayat Samiti is responsible for implementing the decisions of the Gram Sabha and for carrying out the development work in the village.
Option c) is incorrect because a judicial body at the village level is called the Panchayat Adalat. The Panchayat Adalat is a court that deals with minor disputes between villagers.
Option d) is incorrect because a local police force is called the Village Defence Force. The Village Defence Force is a group of villagers who are trained to provide security in the village.