The correct answer is option 1. Let`s look at each statement individually to understand why.

Statement 1: Gram Sabha is a body consisting of all the adults residing in a village.

This statement is correct. Gram Sabha is a gathering of all the adults who are residents of a particular village. It serves as the primary democratic institution at the village level.

Statement 2: A Gram Sabha may exercise such powers and perform such functions at the village level as the legislature at the State level.

This statement is incorrect. While the Gram Sabha is an important institution at the village level, it does not have the same powers and functions as the state legislature. It primarily focuses on matters related to local governance, development, and decision-making within the village.

Statement 3: The sessions of Gram Sabha are chaired by a representative of District/ Block Administration.

This statement is incorrect. The Gram Sabha sessions are typically chaired by the elected head of the village, such as the Sarpanch or the Village Panchayat President. The representative of the District/Block Administration does not necessarily preside over the Gram Sabha sessions.

Therefore, the correct answer is option 1, as statement 1 is correct but statements 2 and 3 are incorrect.