The correct answer is - A. The census is used only to get an accurate population count.
The census indeed is used so that an accurate population count is got, but that is only one of the many things that are required and needed for the census. Every census (though all have some specific modifications) has multiple tasks to achieve, and that is because the census is used by the governments so that they can plan every aspect of the development of the society. Because of this, the census gathers information about, people in a household, age structure, education, ethnicity, race, religion, languages spoken, citizenship/s, job, income etc.
