Final answer:
The woman within the wallpaper shakes the pattern at night, as if trying to escape, which corresponds to the option 'A. She shakes at the bars.' This reflects her perceived actions and symbolizes her entrapment.
Step-by-step explanation:
The question "What does the woman within the wallpaper do at night?" refers to the activities of a figurative 'woman' that a character perceives within the pattern of wallpaper. According to the narrative passages provided, this woman appears to be trapped behind the pattern, which resembles bars, and at night she engages in certain activities.
One excerpt describes the perceived actions of the figure behind the wallpaper: "The faint figure behind seemed to shake the pattern, just as if she wanted to get out." This description aligns with the provided options, indicating that answer A, "She shakes at the bars", is the correct choice. The woman shakes the pattern, which is likened to her shaking at bars, as if trying to escape.
The passages presented touch on various times of day and different actions, but consistently, the character believes that at night, the woman is actively trying to get out by shaking the wallpaper pattern. The dynamic and stifling qualities of the wallpaper are significant motifs in the story, symbolizing the woman's entrapment.