What did John D. Rockefeller do to establish Standard Oil as a monopoly? O kept discovering oil
O set up a trust
O bought stock options
o invested in banks
Please help

d

explanation:

i think that this is the best answer, but im sorry if this is wrong

1.   île de la cité

2. 200 years

3. for the nave and choir

hope im right, havent learned about this in a year

b. the right to wage war and make peace