Answer:
I and III
Explanation:
Although there are many reasons why countries should trade, there are some situations in which trade between these countries are also considered disadvantageous.
Majorly, the opportunity cost a country has in producing a given good gives it a leverage when it goes into international trade with another country. Now, in situations where the two countries produce goods for same opportunity cost, then, trade is considered disadvantageous.
ALSO, the isolation of countries by geography or politics can also make international trade disadvantageous.