The correct option is D Unorthodox nature of Uncle Lico's methodology
In lines 21-35, the author explains how his uncle Lico was a passionate genealogist who used "research, fantasy and spells of breathless madness" to chart his family's ancestry. Through these lines we realize that the author's uncle did not use ordinary or conventional methods of research. Thus we can conclude that the primary effect of these lines is to depict the unorthodox nature of Uncle Lico's methodology. Thus C is the best answer.