So, when I look at this passage, a few things stand out:
- 'mysterious and unnatural organism' - 'characterizations are completely unrealistic' -'people are amazed'
So, in the options, a lot of them are details. Facts. The one that most goes along with the passage is 'People are amazed by Venus flytraps'. This goes with every point or thing that stood out. People think it's a unique organism, that it's used as an unrealistic character, and just the fact that they are amazed. The whole paragraph is about how people think or react to it.
Why do the first two sentences contain qualifiers (“oddly enough,” “however”)?. Ellison is floating some theories here, an activity he has invited the reader to join.
This would be different for everyone. I personally think they are great, but your views are most likely different than mine. If you need help with ideas we can chat.