The governments of (Hungary), Romania, Bulgaria, and Yugoslavia became versions of after WW1 : a) socialist states
b) dictatorships
c) constitutional monarchies
d) empires ruled by regents

C

Explanation:

Sorry if its wrong

answer: ensure protection from communism

explanation:

the north atlantic treaty was largely dormant until the korean war initiated the establishment of nato to implement it, by means of an integrated military structure: this included the formation of supreme headquarters allied powers europe in 1951, which adopted the western union's military structures and plans.