Chinese immigrants. These immigrants came to the United States to work for a better life. They worked mainly on the railroads and constructing new railroad tracks. When the railroads were completed and the railroad companies needed no more tracks, then the Chinese opened their own businesses, which were mostly a failure to them because the Americans would not go to their shops.
I really hope this helps
It deals with opportunity costs. Opportunity costs are not real costs, but rather the things that you had to give up in order to obtain something else. What you didn't obtain is considered to be an opportunity cost. A production possibility curve deals with this.
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I believe the answer is C but I don't know