The play opens with Reverend Parris praying by his afflicted daughter’s bedside. We are left to infer, from the dialogue that follows between Parris and his niece, the details of the events preceding this moment. What do we come to learn has caused Betty’s affliction?
She has been bewitched

She is desperately frightened because her father has seen her meddling with witchcraft

Abigail has poisoned her with a brew made in the forest

She feels terribly guilty because she has had an affair with a married man