let us simplify the argument --
1. Respectable people endorse legalization of drugs
2. these people would not propose a policy that would be harmful ---> little risk in experimenting with a 1 year legalization of drugs.Note that we are drawing a conclusion -- "little risk in experimenting ..." -- based on the subjective opinions of respectable people. It is entirely possible that these people might not have accounted for all the risks associated with implementing such a measure. They might have supported the measure purely based on principle.
Let us take a look at the answer options --
Option A - IncorrectNo specific cases are mentioned that are then generalized. This would have been correct if specific cases such as the results of a study on a particular age group in a particular city was generalized to apply to all population.
Option B - Incorrect"attacks the motives of her opponents" -- this is not done in the argument.
Option C - CorrectThe conclusion is based on the positions of respectable people.
Option D - IncorrectThis does not use circular logic. In circular logic the premise and the conclusion mean the same thing.
for example -- "This argument says abortion should be legal because women have the right to an abortion." The premise (because women have the
right ...) and the conclusion (abortion should be
legal) mean the same thing.
If the argument said something like -- "there is little risk in legalizing drugs because legalizing drugs does not pose any threats/is completely safe" -- then this option would have been correct.
Option E - IncorrectNo mention of others "disproving" her position.