can表许可 — 英语选择题

学校食堂规定：学生必须用饭卡（meal card）买饭，食堂里的食物不能带出食堂。小华带了饭卡，午饭时想买一个汉堡并在食堂吃完。下列说法正确的是：A. He can't buy a hamburger because he has no meal card. B. He can buy a hamburger, but he must eat it in the dining hall. C. He can take the hamburger back to the classroom. D. He can buy a hamburger and eat it anywhere.