Topic: Fill in the Blank,

Best Answer Explained in Below-:

The correct answer to the question is 'B) pertinent'. The term "pertinent" means relevant or applicable to a particular matter. In the context of the sentence, the friend's failure in the examination is attributed to the fact that his answers did not appropriately address the questions presented.

When someone provides answers that are not pertinent, it indicates a disconnect between the questions asked and the responses given. For example, if a student is asked about the causes of a historical event and instead discusses unrelated topics, their answers lack relevance, which can lead to unsatisfactory performance.

In contrast, the other options do not effectively convey the intended meaning. "A) inherent" refers to something that is a natural part of something else, "C) allusive" relates to making indirect references, and "D) inclusive" means including everything or everyone. None of these words indicate the idea of relevance as clearly as "pertinent" does. Thus, using "pertinent" correctly highlights the mismatch between the exam questions and the friend’s responses, which ultimately explains their failure.