Which explains how the coriolis effect causes air circulation?

a.
air from the equator moves toward the poles slower than the ground below it, so friction causes the air to veer east. in contrast, air from the poles moves toward the equator faster than the ground below it, so friction causes it to veer to the west.

b.
air from the equator moves toward the poles faster than the ground below it, so friction causes the air to veer west. in contrast, air from the poles moves toward the equator slower than the ground below it, so friction causes it to veer to the east.

c.
air from the equator moves toward the poles faster than the ground below it, so friction causes the air to veer east. in contrast, air from the poles moves toward the equator slower than the ground below it, so friction causes it to veer to the west.

d.
air from the poles moves toward the equator faster than the ground below it, so friction causes the air to veer east. in contrast, air from the equator moves toward the poles slower than the ground below it, so friction causes it to veer to the west.