Which of the Following Statements Describes the Short-Run Effect(s) of Labor

Which of the following statements describes the short-run effect(s) of labor immigration?

A) The source nation benefits from remittances and a rise in the overall marginal product of labor as some of its workers emigrate.
B) Emigrating workers create a "brain drain," and the marginal product of labor declines in the source nation.
C) Emigration of workers usually lowers the real wage of workers left behind in the source nation.
D) The source nation experiences a decline in the overall marginal product of labor as some workers emigrate.