In the first decade of the twenty-first century, about 80% of the US and Canadian populations were classed as urban.
Population refers to the number of the people including male, female, children, newborn and old age grouped people living in an area as residents over a particular period of time.
During the first decade of the twenty-first century, more than 80% of the people in the United States and Canada were classed as urban. Therefore, it can be concluded that option (c) is correct.
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Your question is incomplete, but most probably the full question was...
Fully ________% of the U.S. and Canadian populations were classified as urban in the first decade of the twenty-first century.
a. 68
b. 50
c. 80
d. 72
