why isnt answer choice B correct here?

@izyat, Happy to help. Let's take a look at (B). This is a very diagrammable stimulus: GA - some - 20th GA - >Original ideas not Influential - >not GA (GA - >Infuential) From this, we can conclude that 20th - some - Original ideas 20th - some - Influential Original ideas - some-Influential Remember, we're looking for an answer choice that doesn't follow logically from the stimulus. In other words, it could be false. (B) says, "Some twentieth-century art involves original ideas." (B) is an inference that we made, and this is something that follows logically from the stimulus. It's not something that could be false, so we can get rid of this choice. (C) says, "Only art that involves original ideas is influential." (C) is making the claim that original ideas are necessary for influential art (Influential - >Original ideas). This is a very, very strong iteration of the third inference we made above (Original ideas - some - Influential), and it's something that certainly could be false. Because it could be false, it's the correct answer choice. Hope this helps. Let us know if you have any more questions!

Hi, I have a question on how you're able to conclude OI-some-I (original ideas-some-influential) as they are both necessary conditions and I could not make a deduction from the quantifiers 20-some-OI and 20-some-I. I narrowed it down to C and A but got stuck there.

All A's are B's All A's are C's Some B's are C's

^ Can someone please confirm if @Luke's comment from 2/13/20 is valid? I believe in the lesson it says you cannot combine "some" statements. So I don't understand how @Ravi 's explanation of ... "20th - some - Original ideas 20th - some - Influential Original ideas - some-Influential" ... makes sense? But if @Luke is correct then I understand.

^ Can someone please confirm if @Luke's comment from 2/13/20 is valid? I believe in the lesson it says you cannot combine "some" statements. So I don't understand how @Ravi 's explanation of ... "20th - some - Original ideas 20th - some - Influential Original ideas - some-Influential" ... makes sense? But if @Luke is correct then I understand.

@hbanana00396, yes, @Luke's comment is valid. If you have two all statements that share a sufficient condition, the necessary conditions of both statements have a "some" relationship with each other.