What is the main idea of this selection?
A Diamonds have been prized for thousands of years, but violence in the diamond trade is a serious problem.
B Until recent times, diamonds were so rare that only kings and queens could afford to own them.
C Even experts and geologists do not really understand how diamonds are formed.
D Diamonds are used primarily in crowns and tiaras worn by members of royal families.
What is the main idea of this selection?
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The correct answer is: A Diamonds have been prized for thousands of years, but violence in the diamond trade is a serious problem.
Explanation: This option captures the main idea by highlighting the historical value of diamonds, while also addressing a significant contemporary issue affecting the diamond trade. It reflects both the admiration for diamonds and the darker aspects of their acquisition. Options B, C, and D focus on specific details rather than the broader theme presented in option A.