Some Europeans' ability to immigrate to the United States was made more difficult by the Johnson-Reed Immigration Act, while others had it made simpler. Thus, option C is correct.
Immigration can be defined as the process when people migrate or move to any other country to permanently move there or reside there, that can be for any possible reason.
The Johnson-Reed Act also called The Immigration Act of 1924 was the law where only 2 percent of people of national origin from each nationality could immigrate to the United States and European country as a whole was big in population.
They were not able to move or didn't fit in that quota also it was necessary as the immigrants were also increasing and populating their country. Therefore, option C is the correct option.
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