European nations eliminated barriers to trade by establishing the?

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.

it reintroduced the two-party system.

wait so (ima delete the answer if i get , so i dont steal points. i apparently cant comment) could someone me with this one? the same photo.

sections b and e in this image both represent (3 points)

select one:

a. district courts

b. courts of appeal

c. trial courts

d. supreme courts