Answer :
The source that is an example of a secondary source is:
OD. A book explaining the environmental harm of too much cotton production.
Explanation:
1. Secondary sources are interpretations, evaluations, or analysis of primary sources. They are created after the event or time period being studied.
2. In this case, a book explaining the environmental harm of too much cotton production is a secondary source because it provides an analysis and evaluation based on primary sources like studies, data, or research conducted on the topic.
3. The book offers a perspective on the environmental impact of excessive cotton production, making it a secondary source in the context of the question provided.
