I believe B would be the correct answer if I am right if not I'd think C.
Answer:
If you were trying to locate a particular topic in a book while doing research, the reading technique which should be used is skimming.
Explanation:
Skimming, scanning and close reading are the type of reading. Skimming is the technique of reading the topics, headlines or the initial paragraphs of the text. Usually, the readers skim the text and then decided to read it.
If you are unaware you don't know what's going on, but if you are unconcerned you know what's going on but you just don't care.
