某小组为研究原电池原理，设计如图装置，下列叙述正确的是

A．装置I，铜片上有O₂逸出

B．装置I，锌片溶解，发生还原反应

C．装置II，电池反应为：Zn+ Cu²⁺= Zn²⁺+ Cu

D．装置II，外电路中，电子从锌电极流向铜电极

After the flooding, people were suffering in that area, _______urgently needed clean water, medicine and shelter to survive.

A．which

B．who

C．where

D．what