Answer:
The correct answers are letters "B" and "D": Punishing the entire class when an ethical violation occurred; Providing ethics training only to students who admitted to cheating.
Explanation:
By punishing the entire class when an ethical violation occurred, Professor Quinn is not acting objectively. In such cases, only the students at fault should be punished for their actions. If the rest of the students acted ethically there is no reason for them to be punished. In remorse, those students could start to act unethically since they know even acting correctly they will be punished anyway.
Besides, providing ethics training only to students is inappropriate. The unethical action must serve as an example for all students in a class as an act that must not be replicated. Thus, all of them should be instructed on what to do to avoid such situations.