Answer:
The correct answer are letter "B" and "C": to maintain levels of trust necessary and to carry out economic transactions.
Step-by-step explanation:
The world market we are into today would not have been possible without countries having social ties. Every good relationship is base on trust, so for economies to risk assets over another, there must be a certain level of trust developed between them. Those economic transactions are not only useful to boost each country's revenues but also it is a reference for unusual regions to get interested in them to start new commercial partnerships.