In the United States Over the Past Few Decades, Increases

In the United States over the past few decades, increases in immigration and the number of refugees seeking asylum have ______.

A) fostered greater understanding and appreciation of immigrant cultures
B) caused increasing anxiety and even sparked an anti-immigrant backlash
C) convinced most U.S. citizens of the need to open the borders and abolish immigration laws
D) convinced most U.S. citizens of the need to ban all immigration