Answer:
B: Immigrants and their children can be good citizens
Step-by-step explanation:
President Cleveland starts by expressing the common view of immigration at the time, one that was common of politicians, the upper class, and the working class. He finishes by stating that the wave of immigrants and their descendants have come to be known as the US's best citizens. It also could be interpreted as him saying that people thought the colonists who founded the country were also viewed as undesirable immigrants who grew to be the best the country had.