Final answer:
An excerpt from the first history text about New Mexico, describing the Spanish entry into a village, is an example of a primary source of history, which includes firsthand accounts and documents from the period being studied.
Step-by-step explanation:
An excerpt from the first history text written about New Mexico, which describes the Spanish entry into the village of Okay Owingeh, is an example of a primary source of history. A primary source is a document or physical object which was written or created during the time under study. Such sources were present at the events being documented and provide direct or firsthand evidence about an event. Examples include diaries, speeches, letters, official records, and eyewitness accounts. In contrast, secondary sources interpret and analyze primary sources; these are usually scholarswriting about events sometime after they have happened.
Given this understanding, an account written about events by someone actually present (such as a historical entry by an explorer or conqueror) would be considered a primary source. This aligns with option a. from the review question, which cites a diary entry by a person who lived in the period under discussion, as an example of a primary source.