The correct answer is: Policy planning, resource allocation, and research purposes.
Census data is collected by governments to provide a snapshot of the population. It is used to determine how many people live in a country or region, their age, gender, race, ethnicity, and other characteristics. This information is used to make decisions about how to allocate resources, such as schools, hospitals, and roads. It is also used to develop policies, such as those related to education, healthcare, and social welfare.
Census data can also be used for research purposes. For example, it can be used to study trends in population growth, migration, and aging. It can also be used to assess the impact of government programs and policies.
The other options are incorrect because they are not the primary purposes of census data. Entertainment and trivia contests do not require census data. Targeted advertising can be done without census data, although it may be more effective if it is based on census data. Political propaganda is not a legitimate use of census data.
In conclusion, the correct answer is: Policy planning, resource allocation, and research purposes.