How does the author's use of flashback affect the story?

A It adds tension by making the narrator and her relatives uncertain about exactly what they are going to find in Slovakia.
B It generates uncertainty by forcing the narrator and her parents to doubt what they remember about Great-Aunt Gertrude.
C It results in a more intimate story by revealing the narrator's innermost thoughts and feelings.
D It ensures clarity by providing all necessary background information in the opening paragraphs.