Can individuals under 21 years old legally purchase a rifle or shotgun from a licensed dealer in South Carolina?

Individuals under 21 years old can legally purchase a rifle or shotgun from a licensed dealer in South Carolina. This is because South Carolina law permits individuals aged 18 and above to purchase long guns from licensed dealers without any special restrictions. Options B, C, and D are incorrect because they impose additional restrictions on the legal purchasing age, such as being 21 years old, requiring parental consent, or limiting the purpose of the purchase to hunting and agricultural purposes. These options do not accurately reflect South Carolina's laws regarding the legal purchasing age for rifles and shotguns.