Concept:Secondary sources are created by analyzing or interpreting primary sources, not from direct experience.
Explanation:Primary sources are original, first-hand records like autobiographies or official documents.
Secondary sources are written by someone who did not witness the event.
They are based on studying and evaluating primary sources.
Examples include textbooks, encyclopedias, and review articles.
The NCERT textbook "Our Pasts I" for class 6 is a textbook.
It interprets historical events rather than being a direct record.
Therefore, it is a secondary source.
Answer:D. Our Pasts I) - NCERT textbook in history for class 6