The phrase which defines muster best is gather to smile. Thus, option 3 is correct.
What is the central theme of the novel?
The metaphor of night is frequently used to represent the situations and feelings that Jews face during the Nazis.
His message is one of peace, forgiveness, and dignity for all people. It took him a long time to believe that the forces opposing evil in the world could win.
Therefore, option 3 gather to smile is the best description for the "muster".
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