Answer :
One of the reasons that the United States encouraged Chinese immigration after the Civil War is option C: many Chinese were useful railroad workers and farm labourers in the West.
The Central Pacific Railroad (CPRR), the western portion of the first transcontinental railroad across the United States, was built in large part thanks to Chinese labourers. The development of the American West and the interconnection of the United States throughout the continent depended on this project, the largest engineering undertaking at the time. Thus the reason behind encouraging Chinese immigrants was to employ them as road workers.
The majority of the Chinese immigrants were peasant farmers who left their homes due to political and economic unrest in China. Most wanted to put in a lot of effort, earn a lot of money, and then go back to their villages and families as prosperous men.
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