It would be easier to answer if i could see the grafic from your textbook, but here is some information, hopefully useful:
A. Montana
historically the second largest producer of silver
B. Nevada
-currently the second largest producer of silver - after Alaska
I think that I would go with this answer - was also home to the Comstock Lode, Tonapah and Eureka silver mining districts.
D. California
-has a number of silver mines
The Ming emperors made it their capital in 1421 and it remained China's capital till 1912 when the Manchu Empire fell and SunYat Sen turned China into a republic.
Answer:
Labor unions give workers the power to negotiate for more favorable working conditions and other benefits through collective bargaining. Union members earn better wages and benefits than workers who aren't union members. On average, union workers' wages are 28 percent higher than their nonunion counterparts.
