Which of the Following Is a Difference Between Employing Foreign

Which of the following is a difference between employing foreign nationals with work visas for work in the U.S. and employing U.S. citizens?

A) the eligibility of foreign nationals to work in the U.S. must be documented on an I-9 form, while this is not required for citizens
B) the duration of employment is limited for foreign nationals, but not for citizens
C) foreign nationals can be paid lower wages and offered fewer benefits than citizens
D) foreign nationals must supply proof of citizenship