the best way for a country to implement foreign policy is unilaterally. with military power. multilaterally…

Brief Explanations:

Multilateral foreign - policy involves cooperation with multiple countries, promoting dialogue, mutual - understanding, and collective solutions. Unilateral actions can lead to isolation, and relying solely on military or hard power often causes tensions and conflicts. Multilateralism is more conducive to long - term peace and development.

Answer:

C. multilaterally