The details in persuasive writing serve as that will support your main point. NO LINKS!
A. evidence
B. subheadings
C. thesis statements
D. description

A. evidence

Explanation:

when writing an argumentative or persuasive essay, the details are always used as evidence

NOT subheadings(that doesn't even make sense)

NOT thesis statements ( the details are trying to prove the thesis, not make more thesis's)

NOT description ( you are not describing anything in an argumentative or persuasive essay you are simply using facts and evidence to prove your point.)

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answer: "the beating heart symbolizes the narrator's conscience, or his sense of guilt and wrongdoing" so its b

explanation:

"to look at him, or hear him describe it, he had no guilt. however, poe decided to symbolize this man's subconscious guilt through the heartbeat."