The answer to your question is c.invented because it's a past participle.
A. Parallel plots
The two women are both fending for themselves while their husbands are away fighting a war. Same plot but in a different time.
The lines which are a flashback here are: She thought of her last day in middle school, seven years ago, when Sarah had given her an iPod. She had felt ecstatic that day when she realized she would be able to listen to her favorite songs and fend off comments from her cousins about how little she knew about music.
Answer:
natural charecters is more powerful then other characters
