Pearson,the Company That Publishes Your Textbook,provides Lots of Different Practice

Pearson,the company that publishes your textbook,provides lots of different practice tests and test questions (including questions in the textbook,and in some cases,online) .These practice tests are:

A) a useful way to figure out what areas of the text you don't yet understand well.
B) a good way to practice different types of test questions,so that you are well-prepared for the exam.
C) mostly useful for students who are struggling in the class.
D) Both A and B