The correct statement is:
A. Both primary and secondary sources can be artifacts.
This is true because artifacts can be original materials from a particular time period (primary sources) or copies or interpretations of such materials (secondary sources).
The other statements are inaccurate:
B. Oral histories are primary sources but are not typically considered artifacts in the traditional sense.
C. A primary source does not interpret a secondary source; rather, it presents original material or evidence.
D. Textbooks are typically classified as secondary sources since they summarize or analyze information from primary sources. However, some textbooks can include primary source material as well.
Thus, option A is the only true statement.