In the United States,payments to Labor Account for Roughly

In the United States,payments to labor account for roughly:

A) 70% of total income,a share that has not fluctuated much in the past 30 years.
B) 50% of total income,but the returns to land have been increasing.
C) 30% of total income,and this number is falling.
D) 90% of total income and can be broken down into human capital and physical capital.