Could you explain why E would be wrong compared to C?

Hi @MACZ, This is a match the flaw question. Let's try to diagram what the stimulus tells us, and then find an answer choice that exhibits a parallel flaw. PETS = party's economic theories were sound PSIP = party had succeeded in implementing its program IRLC = inflation rate would have lessened considerably Premise: PETS & PSIP - > ILRC (This comes from the first sentence of the stimulus) Conclusion: ~IRLC - > ~PETS (This is the second sentence of the stimulus) What exactly is the flaw here? Well, the conclusion attempts to take the contrapositive of the stimulus and use it to get ~PETS. But the contrapositive actually tells us the following: ~IRLC - > ~(PETS & PSIP) Which can be rewritten as ~IRLC - > ~PETS v ~PSIP And note that the contrapositive can be true if PETS & ~PSIP. In plan English, it's possible that the party's economic theories were sound, but that it hadn't succeeded in implementing its program. Thus, we need an answer that has two conditions in the sufficient condition (before the arrow), and then takes the contrapositive and mistakenly negates one when the other one could have been negated. This is what (C) tells us. When we diagram out (C), we get SSS = succeeded in selling its subsidiaries CPNP = used cash to purchase the new patent SPD = stock price doubled in the last two years Premise: SSS & CPNP - > SPD Conclusion: ~SPD - > ~SSS And we can see that this is parallel to the flawed reasoning used in the stimulus, since it's possible that the company sold its subsidiaries but didn't use the cash to purchase the new patent. (E) is wrong because it has another flaw. (E) doesn't have two parts in the sufficient condition, which we can diagram as TV's new weather forecasting equipment worth investment - > Ratings improve & Accuracy of forecasts rise Because (E) has two parts in the necessary condition (after the arrow), but not the sufficient one (before the arrow), we know that it can't be a parallel flaw and can rule it out. Hope this helps, and feel free to ask any follow-up questions if anything is still confusing.