It helps create an element of suspicion is the author uses the narrative technique of characterization in this excerpt. These techniques support the purpose use of craft element of the story.
Narrative technique is the method of crafting the elements of the story. The different narrative technique's element are plots, theme, style and characters of the story.
The example are symbolism, red herring, epiphany, cliffhanger, allegory, parody, subplot.
Thus, option A is correct.
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