![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
It is indicated in the last two paragraphs that
A.
immigration is more a challenge than an opportunity.
B.
immigration can be harnessed to serve the nation.
C.
immigrants can hardly be assimilated into America.
D.
the more immigrants America takes in, the better.