An economy can produce only two goods at any one time. These are good X and one other good from A, B, C or D. The table shows the outputs of goods A, B, C and D with each output of good X when the economy’s resources are fully employed.
Which good must be produced with good X to show a production possibility curve with increasing costs?

1 )
A
2 )
B
3 )
C
D
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