The proposal to extend clinical trials, which are routinely used as systematic tests of pharmaceutical innovations, to new surgical procedures should not be implemented. The point is that surgical procedures differ in one important respect from medicinal drugs: a correctly prescribed drug depends for its effectiveness only on the drug’s composition, whereas the effectiveness of even the most appropriate surgical procedure is transparently related to the skills of the surgeon who uses it.
The reasoning in the argument is flawed because the argument
=> First thing to understand is to understand where does the flaw exist, the question asks to find the flaw in reasoning, The statement 1 is conclusion and that statement does not have any flaw, everything that comes after is reasoning. There are many ways to prove that there is flaw in reasoning - maybe there is a gap in the reasoning, maybe the reasoning is making some assumption, maybe reasoning is incorrect etc.
in this case for me I was confused between A and B, B is just a dense sentence and it took me long to remove all the modifiers to see what is the intent behind option B.
(A) does not consider that new surgical procedures might be found to be intrinsically more harmful than the best treatment previously available => the comparison provided between drug and surgery is not apple to apple comparison. Comparing a drug to surgery is not convincing argument to conclude that surgery shouldn't be implemented. Option A says that the current is worse than past and that is good enough proof to conclude that surgery shouldn't be implemented.
(B) ignores the possibility that the challenged proposal is deliberately crude in a way designed to elicit criticism to be used in refining the proposal => all this options says is Proposal is bad to evoke criticism to refine the proposal intern, very useless statement; super dense but makes zero sense. Its funny how the most non sense options could trick us into believing that there is some deep meaning behind them - INCORRECT
(C) assumes that a surgeon’s skills remain unchanged throughout the surgeon’s professional life => Wait what ?? and why ?? there is no link between the argument and this statement, the topic is not about what happens with passing time - INCORRECT
(D) describes a dissimilarity without citing any scientific evidence for the existence of that dissimilarity => Firstly why is scientific evidence necessary to prove this point, it could be just normal data from past trials, then again similar to option B, some profound thing is said and I am like WoW only to read again, waste my time and reject the option - INCORRECT
(E) rejects a proposal presumably advanced in good faith without acknowledging any such good faith => Good faith ? no such context comes in the passage - INCORRECT