The photograph shows the building of the transcontinental railroad in 1868. The construction of the railroad system in the American West was characterized by all of the following except:
A. Chinese immigrants and African Americans performing manual labor for low wages.
B. industrialists and the federal government cooperating to plan routes, allot land, and fund construction.
C. companies frequently using child labor to perform dangerous tasks such as demolition.
D. a small group of powerful corporations dominating construction with little government oversight.