The best option is A. It presents students with questions based on their answers to previous questions, when taking an accuplacer the test is for what you have learned and know. When you get ready to take a college course in high school you must pass either a reading, writing or math test, its to see what you know. The questions are both easy and hard, they are to test your knowledge.
This is another excuse that the Captain Beatty gives to Montag for why destroying books is good for the society. According to him, any person can potentially be offended by a subject, also he argues that all books are better off destroyed than allowed to incite anger. Captain Beatty uses an example of a book and linking it tobacco and cancer. Something curious is that he shows the benefit of destroying information about lung cancer to keep cigarette companies happy, but there are risks that we can see since people will be less informed of what smoking can do.
Hope this helps.