I’m sure it wasn’t Mr. Pike you saw because he is in London. A. It mustn’t have been Mr. Pike you saw because he is in London. B. It can’t have been Mr. Pike you saw because he is in London

It mustn’t have been Mr. Pike you saw because he is in London.

It can’t have been Mr. Pike you saw because he is in London.

It mightn’t be Mr. Pike you saw because he is in London.

It couldn’t be Mr. Pike you saw because he is in London.