Which of the Following Is a Partially Valid Economic Argument

Which of the following is a partially valid economic argument for restricting free trade?

A) Restrictions on foreign trade will increase employment and permanently reduce unemployment.
B) Removal of restrictions that have existed for years will initially cause inflation.
C) Infant industries need permanent protection to develop and gain productive efficiency.
D) A nation needs to protect industries that are vital to national defense in case of future international conflict.