Consider the Following Premises of a Moral Argument About Immigration

Consider the following premises of a moral argument about immigration:
1) If high levels of immigration by low-skilled workers make it unlikely that we will fulfill our moral obligations to the poorest Americans, then we should reduce or stop such immigration.
2) Currently high levels of immigration by low-skilled workers do make it unlikely that we will fulfill our moral obligations to the poorest Americans.
Which of the following conclusions would make this argument valid?

A) Therefore, we should encourage immigration, especially from countries with low-skilled workers.
B) Therefore, we should reduce or stop high levels of immigration by low-skilled workers.
C) Therefore, we should not reduce or stop high levels of immigration by low-skilled workers.
D) Therefore, we should try to improve the education systems of countries with low-skilled workers.