________ that the left side of the human brain is responsible for logic．

1. A.
   It is generally believed
2. B.
   As is generally believed
3. C.
   That is generally believed
4. D.
   Which is generally believed

________ that the left side of the human brain is responsible for logic．

[　　]

A．It is generally believed

B．As is generally believed

C．That is generally believed

D．Which is generally believed