When group of countries agree to from and join a trading blo
     When group of countries agree to from and join a trading bloc with special relationship between the count, it is called: GATT Free Trade Zone WTO Preferential Trade Arrangement Moving to another question will save this response.  
  
  Solution
Option 4. Preferential trade agreement
Explanation: A preferential trade agreement is a trading block in which participating countries provide preferential access to certain products to the other countries in the block.

