20: ((

the satellite image above shows an area along the border between south carolina and georgia. the border is marked by a narrow, natural feature that extends from the northwest corner of the image to the southeast corner. the feature is labeled by the letter "x". south carolina lies to the northeast of this feature, and georgia lies to the southwest.

what is this natural feature that forms the border between south carolina and georgia in this area?

a. a river

b. a mountain range

c. a long hill

d. a lake