NEED HELP ASAP

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A: Primary sources are historical documents, and secondary sources are modern-day documents.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.