Regarding the Impact of Unions on Wages of All Workers

Regarding the impact of unions on wages of all workers, which of the following statements is correct?

A) Approximately 50 percent of our national income is allocated to human capital, while the remaining 50 percent is allocated to physical capital in the form of rents, interest, and corporate profits.
B) As union membership as a share of the U.S. labor force has declined during the last three decades, the share of national income allocated to physical capital has risen.
C) Unions have consistently opposed minimum wage legislation because it tends to cause unemployment.
D) During the past several decades, the share of output going to capital has been virtually constant, even though union membership as a share of the labor force has decreased.