D Two years later, Joying says the buckets are full and the beach is nearly free of cigarette debris.

• Joying说两年后，垃圾桶里面都是满满的，海滩上几乎没有香烟残骸了。很显然这里是关于垃圾的事，只有D项合适，litter就是乱扔（垃圾）的意思。