SAT Question 2fdfe002: Central Ideas And Details answer and explanation

English - Central Ideas And Details - Inference
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The following text is adapted from Countee Cullen’s 1926 poem “Thoughts in a Zoo.” They in their cruel traps, and we in ours, Survey each other’s rage, and pass the hours Commiserating each the other’s woe, To mitigate his own pain’s fiery glow. Man could but little proffer in exchange Save that his cages have a larger range. That lion with his lordly, untamed heart Has in some man his human counterpart, Some lofty soul in dreams and visions wrapped, But in the stifling flesh securely trapped.
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Difficulty:Medium
Based on the text, what challenge do humans sometimes experience?