America's Open Door Policy on Immigration, Which Allowed All Immigrants

America's open door policy on immigration, which allowed all immigrants to enter and become U.S. citizens, ended with

A) the Chinese Exclusion Act, which suspended for 10 years entrance of the Chinese to the U.S.
B) an immigration act which required all immigrants to pass a literacy test before entering the United States.
C) the Johnson Act which introduced a limit on the number of immigrants who could enter the U.S. in a single year.
D) an immigration act that excluded the Japanese from immigration.