Explanation:

- Headcount ratio: It measures the proportion of a population that lives below the poverty line.

- The formula involves dividing the number of people below the poverty line by the total population.

- This gives a percentage of people in poverty relative to the entire population.

- Option 1: Total poor

- Dividing by the total poor would not be useful as it would always give the result of 1.

- Option 2: Urban poor

- This refers to the poor living in urban areas only.

- Option 3: Rural poor

- This refers to the poor living in rural areas only.

- Option 4: Total population

- This gives a true sense of how widespread poverty is within the entire population.

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