I got this one right but I wasn't very sure about my answer so I wanted to make sure I completely understood it.
I diagrammed the argument as:
economy weak
![Arrow :arrow:](./images/smilies/arrowrt.gif)
prices constant
economy weak
![Arrow :arrow:](./images/smilies/arrowrt.gif)
unemployment rises
![Arrow :arrow:](./images/smilies/arrowrt.gif)
investment decreases
(C) must be true because of the contrapositive of the second diagram.
My reason for eliminating (B) was that the passage never states a direct relationship between unemployment and prices, so (B) could be true. Is that correct?
Then for the either/or statements, I followed the diagramming either/or strategy in the Logical Reasoning Bible. The stuff in parentheses are what I determined the statement's validity to be based on the argument I wrote on the very top.
For (A):
~economy weak
![Arrow :arrow:](./images/smilies/arrowrt.gif)
investment decreases (could be true)
~investment decreases
![Arrow :arrow:](./images/smilies/arrowrt.gif)
economy weak (must be false)
For (D):
~economy weak
![Arrow :arrow:](./images/smilies/arrowrt.gif)
prices constant (could be true)
~prices constant
![Arrow :arrow:](./images/smilies/arrowrt.gif)
~economy weak (must be true)
For (E):
~unemployment rises
![Arrow :arrow:](./images/smilies/arrowrt.gif)
~economy weak (must be true)
economy weak
![Arrow :arrow:](./images/smilies/arrowrt.gif)
unemployment rises (must be true)
So is (A) the answer because (D) and (E) all have at least one must be true? And does that mean for an either/or you just need at least one of the two diagrams to be must be true?
Thank you!