The correct answer is: a) Sarpanch.
The Sarpanch is the head of the Gram Panchayat in Andhra Pradesh. The Gram Panchayat is the lowest level of government in India. It is responsible for providing basic services to the people in its area, such as water, sanitation, and education. The Sarpanch is elected by the people in the Gram Panchayat.
The Mandal President is the head of the Mandal Parishad in Andhra Pradesh. The Mandal Parishad is a higher level of government than the Gram Panchayat. It is responsible for providing more complex services to the people in its area, such as healthcare and agriculture. The Mandal President is elected by the people in the Mandal Parishad.
The Zilla Parishad Chairperson is the head of the Zilla Parishad in Andhra Pradesh. The Zilla Parishad is the highest level of government in a district. It is responsible for providing the most complex services to the people in its area, such as transportation and law enforcement. The Zilla Parishad Chairperson is elected by the people in the Zilla Parishad.
The District Collector is a government official who is appointed by the state government. The District Collector is responsible for overseeing the administration of a district. The District Collector is not elected by the people.