9]
The percentage of US labor force represented by unions was around 33% in the 1950s.
The percentage of US labor force represented by unions is currently around 11%.
The percentage of US labor force represented by unions has steadily declined since the 1950s.
The first option is correct
10]
Board of directors
The third option is correct
Since the 1950s, the percentage of the U.S. Iabor force represented by unions has steadily declined...