When a country establishes foreign policies, whose best interests are considered most important? a. those of the country itself b. those of all countries involved c. those of the other country d. those of all united nations countries

When a country establishes foreign policies, the interest of the country itself (A) is the most prioritized interest in constructing foreign policy. This is logical given that a country creates a strategy for foreign policy and national security based upon representing their own peoples interests first. 

Very useful. it is to learn because history repeats itself so learning about it those mistakes not happen again.