Final answer:
The correct answer is c) Their plot to accuse others of witchcraft, which is revealed when Abigail, Mercy, and Betty are alone, indicating their manipulation of the Salem Witch Trials hysteria.
Step-by-step explanation:
The question pertains to what is revealed when Abigail, Mercy, and Betty are alone in the play. The correct answer to this question is c) Their plot to accuse others of witchcraft. When these characters are alone, their discussion uncovers a manipulative plot where they plan to falsely indict others in the community of witchcraft.
This is a reflection of the mass hysteria and the misuse of the belief in witchcraft for personal vendettas, which characterized the historical context of the Salem Witch Trials. The girls in Salem, including those in the Parris household, contributed to an atmosphere of fear and superstition, which led to a series of accusations and the eventual execution of nineteen people, most of whom were women.