Hi DetailOrient!
I can certainly address this one to try to highlight this point of disagreement between the two speakers.
First, definitely don't worry about no one else posting about this specific question--it's only from the September 2018 test and this forum has been going for awhile, so there's simply been much more time for people to have posted questions about earlier tests.
To this specific question, it should be categorized as a "point at issue" problem (you mentioned that "This doesn't seem to be a 'most strongly,'" so it seemed important to clarify the question type). Point at issue problems might ask the test taker to identify where two speakers agree, or where they disagree. You are correct to apply the Agree/Disagree test, i.e., by looking to answer choices and asking whether each speaker would agree or disagree with the statement. In doing this and finding the point of agreement or disagreement, it's essential to stick exclusively to the information presented in the stimulus and not rely on any extraneous information that one might think is also true by virtue of "commonsense." The only "additional" information one might work with is
inferences that can be made with certainty from the information, like taking the contrapositive or linking a chain of conditional reasoning, but that isn't new information; rather it is information that must be true based solely on the information given. The topic of patent expiration isn't explicitly discussed anywhere in the stimulus so isn't absolutely necessary or relevant toward the goal of ascertaining the right answer.
Here, Dario and Cynthia disagree over whether "patents should be granted for all drug compounds," found in answer choice (B). We can test this using the Agree/Disagree test:
Dario: Agrees ("The government should continue to grant patents for all new drug compounds")
Cynthia: Disagrees ("patents should be granted only for truly innovative drugs, not for minor variants of previously existing drugs")
Dario believes that patents should be granted "for all new drug compounds." By contrast, Cynthia believes that patents should be granted "only for truly innovative drugs, not for minor variants." If a company were seeking a patent for a minor variant of an existing drug, Dario would approve of granting a patent while Cynthia would disapprove.