The output of u. S. Citizens who work in Canada would be included in the: D. Gross domestic product.
Gross domestic product can be defined as the value of goods or products produce within a country at a particular period of time.
If a united State of American citizen work in Canada the output of the United State citizen will be added to the Gross domestic product of Canada.
Therefore the correct option is D.
Learn more about gross domestic product here:https://brainly.com/question/1383956
#SPJ12