Here, Hamlet is using a metaphor. Metaphors compare two things, yet differ from similes in that they don't use "like" or "as." He is comparing Denmark to a prison, meaning that he feels that the city is confining and bleak.
The answer is C. When Amy refers to dinner time with her family, she describes, not a pleasant but a distressing time during which her parents did things and behaved in embarassing ways. The fish cheeks that her father eats and offers her represents Amy's heritage but she would much prefer to just avoid the ritual of serving it and, perhaps not to see Robert's grimace.
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