Final answer:
The word 'calamity' in the sentence refers to an event resulting in great loss and misfortune, specifically the capture of Douglass after his escape attempt.
Step-by-step explanation:
The best definition for the underlined word 'calamity' in the given sentence is option A. An event resulting in great loss and misfortune. In this context, 'calamity' is used to describe the capture of Douglass after his attempt to escape, emphasizing the negative consequences and misfortune he faced.
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