Respuesta :
The answer is: U.S. immigration policy grew stricter in response to fear of terrorists within the domestic borders
Example of this would be The formation of Transportation Security Administration (TSA). Before the terrorist attack on 9/11, there is no such agencies in united states airports.
After the attack, TSA was created along with a list of strict additional rules that being made to prevent potential dangerous weapon that can be used to hijack the plan from getting in.
Answer: The correct answer is A, U.S. immigration policy grew stricter in response to fear of terrorists within the domestic borders