Angola, one of Nigeria's trading partner countries, is trying to protect its domestic oil refineries from competition. To do so, it limits the amount of refined oil that can be imported from other countries. Which type of trade barrier is being described?

that is alot i do not no

answer; a cost benefit analysis;

i believe the answer is: true

our brain need to reach a certain level of development   before it could interpret and understood sound with high difficulties. to proof this, we just need to pay attention in musical preference between children and adults. it is far less likely that children would enjoy things such as orchestra or rock band as much as adults due to the difference in this ability.

the answer is:

a. a closed question always has yes or no​ answers, whereas an open question is a​ free-response question.