Diplomacy is another term for "big stick diplomacy," in which a country's international policies are tied closely to its military strength. example: "the great white fleet" of the early 1900s.

Forceful diplomacy
  
It is a strong form of diplomacy where a country negotiate while making it clear that the options and power of military might are left open. It is like by being bullied by big boys in the international arena. It comes at the backdrop of the realization that negotiating with a weak military is futile in the international arena. It is founded on the principles of realism.

The answer is c socialist