To the nearest $, which of these groups of numbers fall into three DIFFERENT equivalence classes?

A system calculates the amount of customs duty to be paid:

_ No duty is paid on goods value up to, and including, $2,000.

_ The next $8,000 is taxed at 10%.

_ The next $20,000 after that is taxed at 12%.

_ Any further amount after that is taxed at 17%.

To the nearest $, which of these groups of numbers fall into three DIFFERENT equivalence classes?
A . $20,000 $20,001 $30,001
B . $2,000 $2,001 $10,000
C . $2,000 $8,000 $20,000
D . $1,500 $2,000 $10,000