What frightened Kezia at night?

Correct answer: Frightening dreams

The governing concept is identifying the immediate cause of a character's fear from the story's context. At night, Kezia sometimes had frightening dreams and woke up crying. Those nightmares caused the particular fear referred to in the question, so option B is correct. Kezia certainly feared her father's stern voice and scolding, but that was a broader emotional fear connected with her daytime relationship with him. It is not the specific answer to what frightened her at night. The story does not identify a dark room or merely sleeping alone as the direct cause. The time clue “at night” points clearly to bad dreams, while the later comforting scene shows that her understanding of her father changes.