Which of the following best describes constructive feedback?

A) Truthful,fair,not given as a personal attack
B) Supportive,untimely,critical appreciation
C) Clear,biased,no reference to improvement
D) Subjective,personal,general solution

Constructive feedback should be truthful and fair, meaning it is based on objective observations and not given as a personal attack. It should also offer suggestions for improvement. Option B is incorrect because while support is important, feedback should not only be appreciative, but also critical. Option C is incorrect because biased feedback does not serve to help the individual improve. Option D is incorrect because feedback should be objective, not subjective or personal, and should offer specific solutions, not generalizations.