Question

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Explanation:

To use personification, we need to give the key a human - like action. "Struggled with" is an action that a human can do. "Was caught in" is a passive construction and does not give the key a human - like active action. "Jammed up" is more of a description of a mechanical state rather than a human - like action. So "struggled with" gives the key a human - like struggle, which is personification.

Answer:

struggled with