怀牛膝与川牛膝的功效区别是( )

A．怀牛膝偏于清下焦湿热，川牛膝偏于清上部火热

B．怀牛膝偏于补肝肾强筋骨，川牛膝偏于活血祛瘀

C．怀牛膝偏于活血通经，川牛膝偏于强腰膝

D．怀牛膝偏于利尿通淋，川牛膝偏于活血通经

E．怀牛膝偏于祛风湿，川牛膝偏于补肝肾