Which Is the Correct Statement Regarding Tariffs and Trade Restrictions

Which is the correct statement regarding tariffs and trade restrictions?

A) Supporters of protective tariffs say they insulate new domestic industries against well-established foreign competitors.
B) Tariffs are part of a country's legal structure,and thus,cannot established or removed for political reasons.
C) Countries cannot control their foreign trade by forcing businesspeople to buy and sell foreign products through central banks.
D) Embargoes are created to encourage the trade of particular products.
E) Items purchased in different countries cannot have different tariffs if the items are identical.