Which of the following is best described as a secondary source?

A photograph collection typically consists of primary source materials, as photographs capture direct visual evidence of events, people, or places. These images serve as original artifacts that provide firsthand accounts, making them primary sources rather than secondary.

A diary entry is also considered a primary source, as it presents the personal reflections and experiences of an individual at a specific time. This firsthand account offers an unmediated glimpse into the author's thoughts, emotions, and actions, distinguishing it from secondary sources that analyze or interpret such experiences.

A transcribed speech is categorized as a primary source because it records the exact words spoken by an individual during a specific event. It serves as direct evidence of the speaker's ideas and intentions, thus providing original content rather than an analysis or interpretation, which characterizes secondary sources.