Why Was There Such a Dramatic Increase in Catholic Immigrants

Multiple Choice

Why was there such a dramatic increase in Catholic immigrants between 1820 and 1865?

A) There was a mass migration of Irish immigrants, most of whom where Catholic.
B) The Catholic Church encouraged mission to the United States to convert the country to Catholicism.
C) They came so their children could receive a Catholic education at the private school system established in the U.S.
D) They were being persecuted in Europe so they came to the United States for religious freedom.