Marianne Moore's poem "Poetry" paints a very clear image about Line 21 - the immovable critic twitching his skin like a horse that feels a flea. Thus option C is the correct answer.
What is the central idea of the poem "Poetry"?
Moore analyses and breaks down what poetry is meant to convey in this poem. She makes an effort to highlight the significance and value of poetry for an individual.
People generally do not have the time to enjoy something if they do not understand it, according to a recent study.
Therefore, option C - the immovable critic twitching his skin like a horse that feels a flea is an appropriate answer.
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