Final answer:
b) He confesses to signing the devil's book. In 'The Crucible' by Arthur Miller, John Proctor confesses to signing the devil's book to save the accused witches.
Step-by-step explanation:
In the play 'The Crucible' by Arthur Miller, John Proctor confesses to signing the devil's book in order to save the accused witches.
This confession is a false admission made under duress to protect the innocent and prevent further harm.
By confessing to a crime he did not commit, Proctor hopes to undermine the credibility of the court and expose the injustice of the witch trials.