The establishment of Columbia as the state capital was important because

A) it was located in the heart of the upcountry.

B) it was located in the heart of the low-country.

C) it was already established as a vital industrial center.

D) it represented a compromise location central to most citizens.

the answer is: D. It represented a compromise location central to most citizens

State capital is commonly located in area that can be easily reached by other areas in that country. (because some matters could be handled only at the state capital)

If you take a look at the map of south carolina, you can see that columbia is located at the centre of the map with close proximity to railroads for easier access.