Answer:
If I remember correctly it was Jack, I hope this helps!
The phrase "at midnight" describes the when the action (verb) happens, so that makes it an adverb phrase (a group of words describing a verb).
Adjectve describes a noun
Adverb describes a verb
I would have to say B
I hope this helps.
If you're talking about the Witch of Blackbird Pond, then Goodwife Cruff comes to the house with a group and accuses Kit of being a witch because of her association with Hannah. I believe this was around chapter 16 or 17.