What is the main source of a claim?

magazines, encyclopedias, and websites
• the reliable sources the author uses
• the author's personal perspective
• the definitions of important words

The main source of a claim is the reliable sources the author uses. These sources could include magazines, encyclopedias, websites, or any other credible and trustworthy sources of information. The author's personal perspective may inform their interpretation of the information gathered from these sources, but it is not the main source of the claim. Definitions of important words are relevant for clarifying vocabulary and ensuring a common understanding, but they are not the primary source of the claim itself.