Answer:
The answer is D. The national government declares war on a hostile country.
Step-by-step explanation:
Foreign policy refers to how the government functions and connects with the international community.
In this case, a declaration of war too is an act of foreign policy. Although it is a negative one.
Foreign policyis set mainly based on a countries national and global interest and rules over to decide who are the friends (allies) and who are the foes (enemies ) and which states are neutral in their stance.
In addition, a foreign policy directly influences the international trade and the economy of a country.