Answer:
c. The number of immigrants entering the country has varied over time.
Step-by-step explanation:
Migration to the United States is the worldwide development of non-U.S. nationals so as to live for all time in the country. Lawful migration has been a noteworthy wellspring of populace development and social change all through a great part of the U.S. history.
Since the United States is a pioneer pilgrim society, all Americans, except for the little percent of Native Americans, can follow their parentage to workers from different countries around the globe.