Last year, in a nation far to the South, real GDP was $90 million and 900,000 workers were employed. This year real GDP is $100 million, 950,000 workers are employed, and the number of hours each worker works per year did not change. Hence, labor productivity
a- Has decreased
b- Has increased
c- Cannot be compared between the two years because both real GDP and the number of workers increased
d- Has remained constant
e- Might have changed, but more information is needed to determine if it changed