From which region has there been a dramatic increase in immigration to the United States since 1965?

The correct answer is D. Latin America.

Since 1965, there has been a significant increase in immigration to the United States from Latin America. Changes in U.S. immigration laws, particularly the Immigration and Nationality Act of 1965, shifted the focus away from European immigrants and opened the door for more immigrants from Latin American countries. This has led to a diverse influx of individuals seeking better economic opportunities and family reunification in the U.S.