What is the main difference between primary and secondary sources? A. Primary sources are historical documents, and secondary sources are modern-day documents. B. Primary sources are derived from museums and archives, and secondary sources are created by history students and academics. C. Primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. D. Primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.

D. Primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.

Explanation:

Primary sources are the historical sources which are the main sources of this information and may be in the form of old diaries or printings while the secondary sources are derived after studying from the primary sources and making references to it by historians. The secondary sources may include books written on the subject by people.

This validates Primary sources being created during a particular historical era, and secondary sources being created by studying primary sources.

the answer is the government.