Thanks for your question! It can definitely be tricky to find S&N statements when the passage does not explicitly use the common S&N terms. I often found it was helpful to rewrite the sentences to use the typical language, making it easier to understand how to diagram them!
For instance, the first sentence could be rewritten as:
If democracy is to survive (DS), then the average citizen must be able to develop informed opinions about important policy issues (DIOP).
DS - > DIOP Not DIOP - > not DS
Next, the passage tells us that today's society requires that citizens develop informed opinions about many scientific subjects. In other words, if citizens develop informed opinions about policy issues, then these policy issues must include many scientific subjects (SS).
DIOP - > SS Not SS - > Not DIOP
Finally, we know that, when scientific knowledge advances (SKA), the average citizen becomes increasingly unable to develop informed opinions on many subjects.
SKA - > Not DIOP DIOP - > Not SKA
We can then use the transitive property to conclude that:
SKA - > not DIOP - > not DS
Or, as scientific knowledge advances, the public is less able to develop informed opinions on important issues and the survival of democracy is threatened. This is directly restated by answer choice (B), making it the correct answer.
Hope this helps! Please let us know if you have any further questions.
