What can be inferred from the last sentence of the text

A．Low-wage workers from other countries are welcomed in the U. S. than the U. S. labor.
B．He competition between low-wage workers from other countries and the U. S. labor become more direct in more fields than before.
C．Unskilled workers will face more direct competition than highly skilled workers.
D．The low-wage workers from other countries compete with the U. S. labor only in the fields of call centers and programmers.