The correct answer is: A) U.S. immigration policy grew stricter in response to fear of terrorists within the domestic borders.
The U.S. has been a focus of terrorist attacks for decades. The most memorable and gruesome terrorist event being 9/11, which caused almost 3000 casualties in 4 coordinated attacks happening in the span of 2 hours. The frecuency and severity of terrorism led to a more strict immigration policy.
