All--------is a continuous supply of the basic necessities o

All________is a continuous supply of the basic necessities of life.用what 和that的区别,如下
All________is a continuous supply of the basic necessities of life.
A．what is needed B．for our needs
C．the thing needed D．that is needed
这个选A还是 D呢 ,what 和 that 在这里有什么区别