Answer:
Correct answer is Socialist
.
Explanation:
Democratic rule is not correct as it was established during the 90s and made important changes, and led country to EU.
Socialist rule is correct answer as during this regime that was established after WW2, economy started collapsing in the 1960s and that lasted until the democratic regime was established.
Fascists rule is not correct as fascist were not ruling in Bulgaria, except when during WW2 they were controlled by Nazi Germany.
Communist rule never happened in Bulgaria.
The same goes with the last option.
