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The answer is "a high per -capita income"

The common trait among developed nations is having a high per-capita income. The per-capita is the average of each person in the country earned for a year. It is used as a measurement of country's standard living. 
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A most common trade among developed nations is a high per capita income. Thus, the correct answer is C.

What are developed nations?

A developed nation refers to countries that have a  fixed economy and a high rate of per capita income which reflects constant employment opportunities and a lower poverty level.

The developed nations have the control and flexibility in working and have stability in education and health sector. They have established economic resources and provide a high-standard living to their citizens.

Therefore, the correct answer is C high per capita income.

Learn more about developed nations, here:

https://brainly.com/question/1368459

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