The fourth line I think. Hope this helps!
It is definitely not B nor D because those two have negative meanings. It can't be C because excessive means "beyond the usual", which has a slightly negative meaning.
The answer should be A, conversational.
Mary Shelley uses a multiple narrative in Frankenstein. A multiple narrative (sometimes referred to as an epistolary narrative) uses the voices of multiple characters within the text. Epistolary narratives can also use letters (such as Walton's four letters at the opening of the novel and the letters between the Frankenstein family) to detail parts of the plot and storyline.
Audience analysis is the term usually used.
