Which of the Following Statements Best Explains the Reason That

Which of the following statements best explains the reason that many economists adhere to the concept of free trade between nations?

A) Unrestricted international trade increases the prosperity of poor nations.
B) Lower-cost imports reduce the expenses of firms by reducing wages.
C) Domestic product prices tend to remain lower than imported products.
D) Inexpensive exports increase consumer prosperity by reducing expenses.