In a draft about historical census categories, a student includes background information, a transition to another idea, a possible limitation, and one evidence detail. Claim: "Changes in census categories can affect how researchers interpret population trends." Details: Researchers also checked spelling variations in handwritten names. The census pages were scanned from bound volumes stored in a state archive. Some census takers left entries blank when households were absent. A group counted under one label in an early census was divided among three labels in a later census, making direct comparison misleading. Which detail functions as evidence for the claim?