Answer: the correct answer is A.- to stop them from exposing her as a liar
Explanation: Abigail says this to Mary and Betty
. She shows how Abigail is so desperate to make sure no one finds out about her lies thus developing her character.
She wants them to believe that she knows withccraft and terrifies them into believe so to they won´t expose her as a liar, she wants them to be affraid of her so she can do as she wishes. Abigail wants to kill John Proctors wife, and she doesn´t want the girls to tell what happened in the forest, where she allegadelly drank a potion to kill proctor´s wife, so she threatens them so they won´t tell a thing.