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Alright, so let's diagram: "The only way that bookstores can profitably sell books at below-market prices is to get the books at a discount from publishers." So: if a bookstore can profitably sell books at below-market prices, then the bookstores got the books at a discount from the publishers. P1: BPSBMP ==> GDP not GDP ==> not BPSBMP "Unless bookstores generate a high sales volume, however, they cannot get discounts from publishers." So: if they can get discounts from publishers, then bookstores generate a high sales volume. P2: GDP ==> GSV not GSV ==> not GDP "To generate such volume, bookstores must either cater to mass tastes or have exclusive access to a large specialized market," So: if we generate such volume, then the bookstore either caters to mass tastes or has exclusive access to a large specialized market. P3: GSV ==> CMT or EALSM not CMT and not EALSM ==> not GSV We are asked what must be true, i.e. what can be properly inferred. We can use the premises in the argument to properly infer answer choice (C): "A bookstore that profitably sells books at below-market prices gets discounts from publishers." So: if a bookstore profitably sells books at below-market prices, then they get discounts from publishers. (C): BPSBMP ==> GSV not GSV ==> not BPSBMP We can conclude answer choice (C) by connecting "P1" to "P2," like so: BPSBMP ==> GDP ==> GSV, to conclude: BPSBMP ==> GSV. Hope that clears things up! Please let us know if you have any other questions.

I think the above is a typo. we do not need to connect anything as answer choice C is the correct answer from the first premise. What the above says is connecting an argument that generates high sales volume, which is not what C says. This looks like it meant to say B possibly? It looks like both B and C are correct, please advise.

I think the error is in the unless statement. Because it says cannot, I thought it would be NOT DP > GHSV in order to negate it.

I thought that what follows after 'Unless' and 'only' is Necessary condition? "The only way that bookstores can profitably sell books at below-market prices is to get the books at a discount from publishers" Then shouldn't this sentence then diagrammed as GDP --> BPSBMP Please explain

Thanks for your question @YHD You are correct that "unless" and "only" precede necessary conditions. Remember from the same lesson, however, that "THE only" precedes a sufficient conditions