Born but to die, and reasoning but to err" creates rhythm, attention to the phrase"but to" and emphasizes humankind's contradictory nature.
An Essay on Man describes the order of the universe in terms of a hierarchy, or chain, of being. By virtue of their ability to reason, humans are placed above animals and plants in this hierarchy.
Thus, the correct options are the A,C, E, rhythm, draws attention and emphasizes humankind's contradictory nature.
Learn more about the Pope's use of parallelism here:
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