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The imagery in sentence 4 is mainly intended to reinforce the passage’s depiction of Marie as

A reluctantly following someone’s directions.

This answer is correct because sentence 4 mentions how Jessica’s “steely stare shove[s] Marie through the door.” She is being encouraged by Jessica’s look.
Answer physically unable to deny Jessica might be tempting, but since it is the look that “shoved” Marie through the door, there’s no indication of Marie being physically forced to participate in this robbery.