Answer:
C). His fond recollections emphasize his genuine sincerity.
Step-by-step explanation:
Narration plays a vital role in eliciting the desired response from the audience as the manner in which the author relates a text determines how the audience would perceive, experience, or respond to it.
As per the question, the narration influences the credibility in the given excerpt from 'Extremely Loud and Incredibly Close' through presenting 'his fond recollections that emphasize his genuine sincerity' and help win the audience's faith and appeal to them emotionally and ethically as reflected by the descriptions like 'Greco-Roman wrestle', 'circle of dominoes', 'pendulum', etc. Therefore, option C displays how the involvement of recollections in the narration helps in convincing and eliciting the intended response from the audience. Therefore, option C is the correct answer.