How can one determine if information is considered "common knowledge"?

The concept of "common knowledge" refers to information that is widely known and accepted by members of a particular community or the public at large. This means that if readers are familiar with the material without needing to refer to a specific source, it can be classified as common knowledge. When considering the audience's familiarity with information, it implies that the content does not require citation or reference to a specific source because it is generally recognized as true or accepted.

For instance, facts like "water boils at 100 degrees Celsius at sea level" or "the Earth revolves around the sun" are considered common knowledge because they are widely understood and do not require validation through scholarly work or reference texts. This familiarity among readers is what differentiates common knowledge from information that is less known or requires citation.

Other options do touch on aspects of common knowledge, such as being mentioned in multiple sources or included in textbooks, but these could potentially refer to information that is well-documented yet may not be commonly known by the general audience. Therefore, the focus on reader familiarity directly aligns with the definition of common knowledge.