The detail indicating Alonzo is speaking to his aunt on the telephone in the story "Alonzo Fitz" is when his aunt speaks to someone else in the background.
The detail from "Alonzo Fitz" that suggests Alonzo is speaking to his aunt on the telephone rather than in person is:
D. His aunt speaks to someone else in the background.
This detail implies that the conversation is happening over the phone as the speaker can hear someone else in the background, a cue typical in phone conversations but not in face-to-face interactions.
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