Answer:
D. increase the price of imports
Step-by-step explanation:
Trade barriers are restrictions that governments impose on imports to protect national production. Examples of trade barriers are taxes and quotas. According to this, the answer is that trade barriers discourage consumers from buying imported goods because barriers can increase the price of imports, for example, when government imposes barriers like taxes on the imported goods, this generates additional costs that are translated to the price of the good making it expensive.
The other options are not right because trade barriers discourage imports decreasing the volume of trades and they can increase the taxes.