The decennial Indian Census is never flawless: hundreds of thousands of citizens probably go unrecorded. However, the basic demographic picture of the country captured by the census is quite correct. A lot many poor people go unrecorded, especially the homeless or the migrants; but some rich people are also left out as they are often travelling or visiting other countries. Which of the following is an assumption on which the argument above depends?

For personal and economic reasons, both the rich and the poor sometimes go unrecorded in the decennial Indian Census.

All citizens of India may reasonably be classified as either poor or rich.

The percentage of poor Indian citizens unrecorded by the decennial census is close to the percentage of rich Indian citizens unrecorded.

The number of homeless or migrant Indian citizens is approximately equal to the number of rich Indian citizens.

The primary objective of the decennial Indian Census is to capture the economic status of the citizens of India.