Was it at the end of the exploration   you discovered the evidence     the monsters used to exist in the lake?

Was it at the end of the exploration   you discovered the evidence     the monsters used to exist in the lake?

1. A.
   which；which
2. B.
   that；that
3. C.
   where；that
4. D.
   that；which

Was it at the end of the exploration    you discovered the evidence      the monsters used to exist in the lake?

A．which；which    B．that；that    C．where；that   D．that；which

Was it at the end of the exploration   you discovered the evidence     the monsters used to exist in the lake?

 Was it at the end of the exploration    you discovered the evidence      the monsters used to exist in the lake?

A．which；which    B．that；that    C．where；that   D．that；which