It is reported that up to now, mountain slides have cut off more than ten villages from the outside world, ______more than 100 hundred people alive and ______ many houses.

A．buried; destroyed

B．burying; destroying

C．to bury; to destroy

D．being buried; being destroyed

有黄金、白金、白银三种材质的情侣对戒各6对，对戒样式相同，装在一个黑色的袋子里，从袋子里任意取出戒指，为确保至少有2对对戒材质不同，则至少要取出的戒指数量是______。

A．10只
B．12只
C．15只
D．18只