The correct answer is B. Background information on the topics to be covered in class.
Explanation:
To preview one material or text involves to quickly look at the material (skim) and understand what the material is about. Moreover, one the general topic is identified the reader should try to remember background information or information he/she already knows about the topic. This helps the reader to better understand the material once it is read. Moreover, this strategy is ideal for class material because by previewing the materials students can activate their knowledge on the topic covered in the class (option B).