Which of the following locations is it illegal to carry a concealed weapon in Ohio?

Carrying a concealed weapon is legal in most places in Ohio with a valid concealed carry license. However, in certain designated areas, it is illegal to carry a concealed weapon even with a license. Of the options given, only choice C, a school safety zone, is one of these designated areas. Options A, B, and D are all generally permissible places to carry a concealed weapon with a valid license. Public parks, grocery stores, and private office buildings are not specifically designated as areas where carrying a concealed weapon is prohibited. However, it is always important to check local laws and regulations to ensure compliance with any specific rules and regulations regarding concealed carry.