分解因式：

（1）-8a³b²+12ab³c-6a²b

（2）3a（x-y）+9（y-x）

（3）（2m-3n）²-2m+3n

（4）16mn⁴-m

________ parents say and do has a lifelong effect on their children.

A．That

B．Which

C．What

D．As