Hi! i think you forgot to say what the passage is! its ok ive done that to!
Answer:
Students assume that studying or memorizing is unimportant during an open book test since they can copy directly from the book. For a variety of reasons, this is a myth. Exams, for example, may have a word restriction, limiting your ability to replicate all of the information presented in the book. Instead, you must choose the most important points, which may take some time if you are unfamiliar with the subject. They may also phrase the question differently, for example, asking you to analyze or solve rather than define.
Explanation:
I lay there in bed; unable to sleep so i began to start counting sheep
I believe it is B. Since sour and unrelenting both are synonyms to anger it just makes the most sense.