Most of the world's kimberlite pipes do not contain diamonds in profitable quantities. Which statement best reflects this?

Most of the world's kimberlite pipes do not contain diamonds in profitable quantities. Which statement best reflects this?

• A. All kimberlite pipes contain diamonds
• B. Most kimberlite pipes do not contain diamonds in profitable quantities
• C. Every kimberlite pipe is diamond-rich
• D. None of the kimberlite pipes contain diamonds

Answer: (B)

The idea being tested is that kimberlite pipes are not uniformly rich in diamonds; many exist but only a minority deliver diamonds in quantities that make mining profitable. Kimberlite pipes can carry diamonds, but economic viability depends on diamond grade, size, ore body, and mining costs, so most pipes don’t meet the threshold for profitability. This is why the best reflection is the statement that most pipes do not contain diamonds in profitable quantities. It matches the real-world situation: diamonds occur in some pipes, but farmers markets of pipes are economically nonviable, so only a subset become profitable sources. The other possibilities would imply universal diamond richness in all pipes or none at all, which contradicts the actual distribution and profitability picture described.

The idea being tested is that kimberlite pipes are not uniformly rich in diamonds; many exist but only a minority deliver diamonds in quantities that make mining profitable. Kimberlite pipes can carry diamonds, but economic viability depends on diamond grade, size, ore body, and mining costs, so most pipes don’t meet the threshold for profitability.

This is why the best reflection is the statement that most pipes do not contain diamonds in profitable quantities. It matches the real-world situation: diamonds occur in some pipes, but farmers markets of pipes are economically nonviable, so only a subset become profitable sources.

The other possibilities would imply universal diamond richness in all pipes or none at all, which contradicts the actual distribution and profitability picture described.