下面关于螺纹说法错误的是（）

A．螺纹上相邻两牙对应点间的轴向距离称为螺距

B．同一条螺旋线上相邻两牙对应点间的轴向距离称为螺距

C．单线螺纹导程L等于螺距P

D．多线螺纹导程L等于线数n与螺距P的乘积

I admire those people. ________ having little money, they feel happy and satisfied.[ ]

A. With  

B. Because of

C. Instead of  

D. In spite of