分解因式：

（1）2x²-x；

（2）16x²-1；

（3）6xy²-9x²y-y³；

（4）4+12（x-y）+9（x-y）²．

Overall, it is going to become much easier for people to communicate （） the Net Communicating with others in real time will soon be the norm.

A．by

B．in

C．over

D．onto