How did us labor unions treat chinese immigrants in the 1800s?

Incomes of u.s. households in the 1970s and 1980s a. grew rapidly, due to the widespread success of labor unions in pushing up wages during those decades. b. grew rapidly, due to several increases in the minimum wage during those decades. c. grew rapidly, due to government policies that discourage the importation of foreign products during those decades. d. grew slowly, due to slow growth of the output of goods and services per hour of u.s. workers' time during those decades.