Disclaimer: I got the answer wrong by misreading answer choice (e), but after review I still believe that my diagram setup works to produce (b).
This is a Nested Conditional.
(DID>500 --/--> RADMV) ----> IDS
Simplified:
DID>500 ----> RADMV or IDS (original)
noRADMV and noIDS ----> noDID>500 (contrapositive)
The simplified, original diagram produced the answer to (b), since the or statement was limited by the stimulus, leaving "IDS" (incapable of doing so). Also, the same answer-choice grants that "DID>500" occurred.
The diagram setup allows for (b) and agrees with the stimulus.
