细节题。关键句：文中第五段第一、二句话“There，food and drinks in commercial packaging are prohibited．The ban is enforced by requiring that each and every visitor heading from the camping ground to the waterfall has to pass through a checkpoint where their bags are inspected and potential garbage is seized．”可知，进入瀑布领域的游客都得将装食品和饮料的可能产生的垃圾包装留下，这种垃圾是不能带入风景区的。故正确的答案为B。