Hurricane Sandy's arrival and its effects ________ New York's offices being closed for three days.

A．carried out

B．came up with

C．led to

D．caught up with

在冰熔化成水的过程中，下列物理量质量、体积、密度、温度、内能、比热容中，变小的物理量有　　　　　　　　，不变的物理量有　　　　　　　　　。