Probably the hardest Q1 I've done so far.

I feel like I'm well versed in conditional logic, but I was having a hard time mapping the conditionality of the first few sentences, before the statement "This is the hallmark of expertise..." I've mixed up the sufficient and necessary cond. for instance, in a statement like "A is the prerequisite of B". #help

I ruled out AC D because of the wording "yet discovered", which I took to mean "haven't discovered". I thought LSAT writers were trying to be tricky with the word yet, so I chose AC C...

PT 37: -4 reading comp; -0 logic games; -20 LR.... this is insane.

Ok, I get why AC A is incorrect, but I still don't get why AC C is correct. Doesn't the description "powerful tool for helping people quit" enough for us to assume it is successful? JY says there isn't anything that indicates success, but that description in itself does. If it read "a tool for helping people quit", I think I would have gone with AC C, but that's where I'm lost. #help

I've found Flaw in Reasoning Q's to be the most common and difficult question type on the LSAT. If you can master Parallel Reasoning Q's & Flaw Q's, the rest of the question types seem much easier.