One of the Reasons Why the GATT Rounds of Trade

One of the reasons why the GATT rounds of trade negotiations during the 1950s accomplished little in the way of tariff reductions was the:

A) lack of participation on the part of the European countries.
B) withdrawal of the United States from the GATT.
C) Cold War, which demanded policy makers' full attention to the detriment of issues such as trade policy.
D) "no-injury" clause included in the U.S. Congress' legislation giving the executive branch the authority to negotiate trade agreements.