The correct answer is: a) Sarpanch.
A Sarpanch is the elected head of a village panchayat in India. The panchayat is the lowest level of government in India, and the Sarpanch is responsible for overseeing the day-to-day running of the village. The Sarpanch is also responsible for representing the village to the higher levels of government.
The Block Development Officer (BDO) is a government official who is responsible for a block, which is a group of villages. The BDO is responsible for implementing government programs and schemes in the block, and for coordinating the work of the various government departments in the block.
The Tehsildar is a government official who is responsible for a tehsil, which is a sub-division of a district. The Tehsildar is responsible for maintaining land records, collecting taxes, and issuing various certificates.
The District Magistrate (DM) is the chief administrative officer of a district. The DM is responsible for law and order in the district, and for coordinating the work of the various government departments in the district.
The Sarpanch is the primary link between the government and the people at the village level because the Sarpanch is elected by the people of the village and is responsible for representing the village to the higher levels of government. The BDO, Tehsildar, and DM are all government officials who are appointed by the government and are not directly accountable to the people.