He knew that Shadow has a long memory , and that he would never forget the trick by which Chatterer had escaped , and so the only way Chatterer would ever be able to have a moment 's peace would be to leave the Green Forest for as long as Shadow the Weasel chose to stay there .

Can we draw the following conclusion?
Shadow has trouble remembering things.

Options are: A). Yes B). It's impossible to say C). No
C).