Thank you for your question. The snake in your photograph is an adult northern brown snake, scientific name (Storeria dekayi dekayi). It is a non-venomous species. Typical length is approximately 12 inches, and maximum length is approximately 18 inches.
This species has several subspecies. Their range extends from portions of Maine south to Florida, west to Texas and north to South Dakota. They are found in both hardwood and pine forests, elevated dry areas of swamps and margins of wetlands. They are also commonly found in garden beds underneath mulch, pine straw or leaf litter.
They feed primarily on earthworms and slugs, but they also feed on insects, spiders, snails (they pull the snail out of its shell before consuming them) and small salamanders.
Here's a link to the website Amphibians and Reptiles of North Carolina where you can find additional information on this species:
Here are some excellent field guides for snakes in South Carolina:
Gibbons, Whit. (2017). Snakes Of The Eastern United States. Athens: The University of Georgia Press.
Gibbons, Whit and Dorcas, Mike. (2015) Snakes of the Southeast(2nd ed.). Athens: The University of Georgia Press.
I hope this information helps, and thank you for contacting Ask an Expert.