Argument - Because doctors consume sugar hence sugar is good.
A - opinion over here is that sugar is good and there is an evidence for it i.e doctors consume sugar. Hence this option is incorrect as the author here is indeed voicing an opinion but that opinion does not lack any evidence - INCORRECT
B - the group that this option is referring to is doctor, this argument does not generalize the qualities of a doctor - INCORRECT
C - the popular opinion over here is the fact that doctors can never be incorrect i.e. doctors, owing to their professional knowledge can never take any decision which they ideally shouldn't . This argument is not contradicting popular opinion but is rather submitting itself to one. - INCORRECT
D -this argument is indeed appealing to authority, the authority over here is the doctor. But there are no conflicting opinions. -INCORRECT
E - experts, doctors in this case can indeed take actions which they ideally shouldn't (from health's perspective) - CORRECT
This is good question in that it teaches us that we as humans tend to fall prey to authority i.e. whenever a person of authority says or does something that is correct. This question teaches us that we need to arrive at a conclusion logically rather than falling prey to authority
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