Documentary about the history of US immigration is the source would help you identify causes and effects of different immigration policies. Hence, option C is correct.
The legislation concerning entry and residence privileges, authorization to work, the rights of asylum seekers, and other policies that help states manage the influx of people wishing to settle within their borders are all considered to be part of immigration policy.
Immigration has significant economic advantages, such as a more flexible labor market, a broader pool of skills, greater demand, and a wider variety of creative ideas. But immigration is a divisive subject. According to some, immigration may result in issues with crowding, congestion, and an increase in the demand for public services.
Thus, option C is correct.
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