Final answer:
Primary sources are objects or documents that come directly from the time period being studied. Examples include diaries, letters, government documents, photographs, and interviews with eyewitnesses.
Step-by-step explanation:
Primary sources are objects or documents that come directly from the time period being studied. Examples of primary sources include diaries, letters, government documents, photographs, and interviews with eyewitnesses.
An example of a primary source in the given options is a letter written by a soldier during a war. This document provides a firsthand account of the events taking place during that time period.