The correct answer is: B. the electorates of the respective territorial constituencies.
The members of the panchayat are elected by the electorates of the respective territorial constituencies. The electorates are the people who are eligible to vote in the elections. The elections are held every five years. The members of the panchayat are responsible for the
development of the villages and the welfare of the people. They are also responsible for the implementation of the government schemes and programs.Option A is incorrect because the district officer does not nominate the members of the panchayat. The
district officer is responsible for the administration of the district. He/She is appointed by the state government.Option C is incorrect because the local self-government minister of the state does not nominate the members of the panchayat. The local self-government minister is responsible for the development of the local self-government institutions. He/She is appointed by the state government.
Option D is incorrect because the block development organization does not nominate the members of the panchayat. The block development organization is responsible for the development of the blocks. It is an organization under the state government.