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Question: Which of the following sentence correctly uses punctuations?

a.

Singapor's "Gini coefficient", the best-known economic measure of income disparity-is the second highest in the developed world.
b.

Singapor's "Gini coefficient"- the best-known economic measure of income disparity-is the second highest in the developed world.
c.

Singapor's "Gini coefficient": the best-known economic measure of income disparity; is the second highest in the developed world.
d.

Singapor's "Gini coefficient"; the best-known economic measure of income disparity; is the second highest in the developed world.