Context is characterized as the situational background or circumstances in which a specific event takes place that helps clarify the meaning of the event or occurrence. Similarly, the words that are placed in a text before or after an unfamiliar word help clarify its meaning to the readers.
In the given passage, the word 'principle' denotes the meaning 'standard ruling' as per the context. <u>The author conveys that he had been unable to find a standard rule regarding books on which everyone agrees</u>. He expresses that it had been different for different individuals as some are useful for some people while others for others. Thus, <u>option b</u> is the correct answer.
The study was done with research, while with the people's feelings, that is just an opinion, and the family vacation package is not really a credible source.
