The best statement that best describes why professor smith can’t discuss how the student is doing in her class is that it is against the teaching ethics.
The teaching ethics requires teacher to exercise confidentiality about the performance of the student in class activities
Hence, Professor Smith's refusal to discuss Sally's performance is in line with professional ethical requirements in teaching.
In conclusion, the best statement that best describes why professor smith can’t discuss how the student is doing in her class is that it is against the teaching ethics.
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