The numbers of immigrants who entered the United States during the industrial age was in the

O thousands.

Ohundreds of thous ands.

Omillions.

O hundreds of millions.

Option C, millions, is the right answer.

Explanation:

The United States during the colonial era as well as the first phase of the 19th century experienced major waves of immigration. Moreover, during the time of Industrialization, the United States of America received more than 20 million immigrants. The immigrants during this time came from various parts of Europe such as Central, Eastern and Southern Europe.