Answer:
C). Fearfulness
Step-by-step explanation:
Repetition is one of the most commonly employed literary devices which helps the author to captivate the readers' attention and emphasize a particular idea or event in the narrative.
In Equiano's narrative, the repetition of words 'horror and horrors' throws light upon the inconceivable fearfulness felt by the African slaves. The fear and terror was so extreme in America that they were willing to commit sui-cide. The narrative primarily aims to emphasize the pathetic condition of the slaves and encourage the idea of keeping humanity over everything. Thus, option C is the correct answer.