Option c is the correct answer. The function of registering births and deaths has been continuous from the time of the Mauryan period to the present municipal administration. This practice of recording vital events like births and deaths was important for administrative purposes even in ancient times. It helped in maintaining demographic records, taxation, and various social and legal matters. This function has endured through centuries and is still a key responsibility of modern municipal administrations to keep track of population data, issue birth and death certificates, and manage related documentation.