The official enumeration of population done periodically is called ______.

Correct option is A

The official enumeration of population done periodically is called a Census. It is a process of collecting, compiling, analyzing, and publishing demographic, social, and economic data of all persons in a country or a specified area at a particular point in time.
Census data provides important information for policy and decision-making, planning, and research purposes. Census is usually conducted every 10 years in most countries, although some countries conduct it more frequently or less frequently depending on their specific needs and circumstances.