Which of the following best describes the difference between the four epochs of American immigration history?
a. Most immigrants from Europe came at the turn of the twentieth century.
b. Immigrants during the colonial period came from Asia, while those during the mid-nineteenth century came from Europe
c. Most immigrants from Europe came after 1965, while most from Asia came after 1990
d. Immigrants during the colonial period came from Europe, while those during the mid-nineteenth century came from South Asia