Conflict minerals
A. are those that display two different colors depending on the direction in which they are viewed.
B. are those that have a substantially reduced hardness in one crystal direction in comparison to other crystal directions.
C. are those that represent the primary assets of a country that are surrendered to the victor in a war between nations.
D. are those mined in countries as a principal source of revenue to support warring factions or repressive governments.
Answer: D
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