The old couple wanted to sell their house and ______ it in a newspaper.

A．advertised

B．advertised for

C．advertised on

D．advertised to

已知函数f（x）=kx³-3x²+1（k≥0）．

（Ⅰ）求函数f（x）的单调区间；

（Ⅱ）若函数f（x）的极小值大于0，求k的取值范围．