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In West Calverton, most pet PS -most→ SEB stores sell exotic birds.
Most of those [pet stores] PS + SEB -most→ STF that sell exotic birds also sell tropical fish.
Any pet store there that sells PS + STF + ~SEB → SG tropical fish but not exotic birds does sell gerbils.
No independently owned IO + PS → ~SG pet stores in West Calverton sell gerbils.
If the statements above are true, which one of the following must be true?
Most pet stores in West
The statements do not discuss pet stores that are not independently owned.
4% picked this
No pet stores in West
This negates the third PS + STF + SEB → ~SG statement.
16% picked this
Some pet stores in West
The third statement indicates SG ↢some↣ SEB that some pet stores in West Calverton that sell gerbils do not sell exotic birds, but that does not mean that some pet stores that sell gerbils do sell exotic birds.
8% picked this
No independently owned pet store
Why this is right
This follows from IO + PS → ~(STF + SEB) the third and fourth statements.
Skill tested: Must be True · how this choice captures the argument's function is the move to repeat next time.
60% picked this
Any independently owned pet store
(E) is talking about indie stores that don't sell fish. Since they're indie stores, we know they won't sell gerbils (indie --> ~gerbil). But we don't learn anything by knowing it's a store that doesn't sell tropical fish. We don't have any rule for stores that DON'T sell tropical fish. So all we know about the stores (E) is talking about is that they don't sell gerbils. We don't know whether or not they sell exotic birds.
11% picked this
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