Which of the Following Statements Is FALSE

Which of the following statements is FALSE?

A) By law, employers must pay prevailing U.S. wages to non-citizens who hold work visas.
B) Employers that knowingly hire non-citizens without appropriate work visas are subject to fines.
C) It is illegal for employers to replace their current U.S. workers with workers who are non-citizens, even if the non-citizen workers are more qualified than the U.S. workers and willing to take lower pay.
D) U.S. unions are usually pro-immigrant, because of the long history of immigrant workers being strong union members.