In South Dakota, is it legal to carry a concealed firearm in a bar or restaurant that serves alcohol?

In South Dakota, it is legal to carry a concealed firearm in a bar or restaurant that serves alcohol unless otherwise posted. South Dakota law allows individuals with a valid concealed carry permit to carry a concealed firearm in certain establishments that serve alcohol. However, it is important to note that individual bars or restaurants can post signage prohibiting the carrying of firearms on their premises, in which case it would not be legal to carry a concealed firearm there. So, the correct answer is A.

Options B, C, and D are not the best choices because they do not reflect the specific provisions of South Dakota law regarding carrying a concealed firearm in establishments that serve alcohol.