Answer: I believe your answer would be C. Ethnicity.
Explanation: A is wrong because dehydration basically means a lack of fluids (water) which causes you to become dehydrated. B is wrong as well because graffiti is art, which isn't what we're looking for. D is wrong because Epidermis is the surface epithelium of the skin, in other words, not "cultural heritage". Ethnicity is about as close as you can get when it comes to "cultural heritage."
Have a great day! :)