Prior to the 1500's, most people accepted the view that the planets within our solar system revolved around
a. earth.
b. the sun.
c. each other.
d. earth's moon.

i think the answer is a and i hope this ; ))

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

hope this ! : )