下列各图描述的实验中，用来说明声音的传播需要介质的是

A．发声的音叉激起水花

B．音叉发出的声音越响，乒乓球被弹开得越远

C．钢尺伸出桌边的长度变短，振动时声音音调变高

D．抽取玻璃罩内的空气，听到罩内的音乐声减小

Many people who had seen the film were afraid to go to  the forest when they remembered

the scenes____   people were eaten by the tiger.     [      ]

A. in which                            

B. by which    

C. which                          

D. that