Given below is a sentence with or without an error. The error, if any, is in one part of the sentence. Choose the correct part which contains the error. In case no error; choose option e ‘no error’. The poverty index is a statistical measure used to gauge the extension of poverty within a population, typically by considering income levels, access to basic necessities, and socioeconomic disparities.

The word ‘extension’ should be replaced with ‘extent’ to make the sentence grammatically correct. Extent: "Extent" refers to the degree, magnitude, or range of something, typically in terms of space, size, or quantity. It indicates the scope or reach of a particular phenomenon, action, or concept. It often answers questions like "how much" or "to what degree." Example: "The extent of the damage caused by the earthquake was extensive, stretching across several miles." Extension: "Extension" refers to the act of extending or the state of being extended. It can denote the lengthening or enlargement of something, either physically or metaphorically. It can also refer to an additional part that is added to something to enlarge or lengthen it. Example: "The deadline for the project was granted an extension, allowing the team more time to complete their tasks."