To build indirect characterization, an author often shows a character's personality through their actions, dialogue, or thoughts rather than explicitly stating it. Among the options provided, the best line to reflect this indirect characterization would be:
"You must forgive me," Sarah implored. "I still have not finished the book, and I need to borrow it one more week."
This line suggests aspects of Sarah's personality, such as her perhaps being apologetic or maybe even irresponsible with her reading commitments, without stating those qualities outright.