One of the key goals of the supreme court, headed by chief justice earl warren in

The correct answer should be C). Require the states to abide by the provisions of the Bill of Rights regarding procedures in criminal cases

This is because the Warren court was known for the way that they managed to implement the fourteenth amendment in their fight for civil rights. They weren't the ones who reduced federal power but rather increased it and heights that weren't there before. They also participated in numerous cases that involved the bill of rights and the constitution.

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