The Gun-Free School Zones Act (GFSZA) is an act of the U.S. Congress prohibiting any unauthorized individual from knowingly possessing a loaded or unsecured firearm at a place that the individual knows, or has reasonable cause to believe, is a school zone as defined by 18 U.S.C. 921(a)(25). The law applies to public, private, and parochial elementary schools and high schools, and to non-private property within 1000 feet of them. It provides that the states and their political subdivisions may issue licenses that exempt the licensed individuals from the prohibition.
Answer this question, making sure that the answer is supported by the text: is it illegal to carry a gun in a school?

Choose from: A). no. B). yes.
B).