the island of knights and knaves

[con-amca]

The inhabitants of this island are either knights or knaves. Knights always tell the truth, knaves always lie.

A visitor to the island meets three inhabitants, A B and C.

A and B make statements as follows:
A: "all of us are knaves".
B: "exactly one of us is a knight".

What are A, B, C?

[Dinkypuzzled]

A and C are knaves.
B is a knight.
Do you want an explanation ?

[con-amca]

You've got it, Dinkypuzzled. No, I don't think an explanation is necessary. I'm sure you worked it out just fine. Well done.