Why Was the Hans-Celler Act Significant with Regards to American

Why was the Hans-Celler Act significant with regards to American immigration patterns?

A) The Act prohibited immigration for a period of 50 years, causing the population to decline drastically.
B) The Act was an open door policy which welcomed immigrants into the United States. As a result, employment opportunities became scarce, and racial discrimination became an even bigger problem than ever.
C) The Act eliminated the national origins system that favored immigrants from northern and western Europe. After the Act was passed, immigration from Asia, Latin America, Africa, the Middle East, and the Caribbean increased.
D) It had no effect. The Hans-Celler Act is related to gender equality in the workplace.
E) None of the above