The "Increase Domestic Employment" Argument for Protection Against Free Trade

The "increase domestic employment" argument for protection against free trade:

A) is that keeping out foreign imports allows the goods and services to be produced by domestic workers.
B) can't keep workers employed in their present occupations, because it leads to more costly production of goods and services.
C) is a valid argument against free trade.
D) is most likely to succeed in restricting trade if the economy has full employment and a tight labor market.