Answer:
They think that Betty has been bewitched so if she really was she would not be able to survive hearing the Lord's name. More likely the reason was that she heard everything about the affair between John Proctor and Abby.
This passage: "For ye shall hear, how our heavenly king Calleth Everyman to a general reckoning:" which goes like: "As you will hear how our heavenly King called every human being for the final judgement."
I believe that the answer is b.
