Concept:Opinion sampling is used to measure existing public views, not to generate or provoke them.
Explanation:Opinion sampling gathers views from a representative part of the population.
It helps to show popular thinking and standpoints on different matters.
It can also assist in preparing public expenditure by revealing what citizens prefer.
In politics, it is used to assess the strength of a political party.
However, inspiring public reasoning on population census is not a typical purpose.
Opinion polls collect opinions rather than inspire or instigate new reasoning.
Therefore, the option that is not a valid reason is the one about inspiring census reasoning.
Answer:D. to inspire public reasoning on population census