Discussion
A major limitation to census as a source of population data is ......
Answer: C
The key's answer is Frequent boundary modification both within the country and at international scale.
A census counts people within administrative units: districts, states and countries. When those boundaries change between censuses, as when new districts or states are carved out or national borders shift, figures for the same named unit are no longer comparable over time. This is a well-known limitation of census data for studying population change.
Changes in demographic parameters are what a census measures, not a limitation of it. Census enumerators and governments change, but census procedures and definitions are standardised precisely so that such changes do not affect the data.
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