The demacratic elections held in 1989 in Poland were demonstrative of what was occuring in Eastern Europe, which was Soviet takeover and establishing communist systems
the diffusion of democratic ideals
unification of communist satellite countries
movement to abolish monarchies
Oc
Od

Option A, Soviet takeover and establishing communist systems

Explanation:

The  demacratic elections held in 1989 in Poland marked the end of communism in East Central Europe with the winning of Soviet  over the communist in Poland.

The reforms led soviet to assume power and end 40 years of dictatorial Communist rule.

Hence, option A is correct

protected civil liberties and outlawed slavery in the new territories.