I believe it is wrong to select an answer which gives an alternative explanation. The stimulus isn't asking for a resolve, reconcile or explain, it is asking to properly infer the author's conclusion. In this way, B doesn't guarantee the author's conclusion as it doesn't connect the author's premise to their conclusion.

I 100% agree with you. This exercise expected us to combine all the past few lessons we have been learning together. I think it's normal to be somewhat stumped. I certainly was, and kept making mistakes. I'm going to compensate by going over previous indicator words and committing them to memory.

I found a good method to be having indicator words be the first thing I look at to gauge the order. After that though, I run through the answer in my head, while visualizing what that would look like in the venn diagrams we have been going over. If the order is consistent with the venn diagram, ie. I can visualize different circles in different circles and it actually makes sense, I leave the answer. However, question 3 and 5 ran contrary to the venn diagram intuition. For these, I gave some extra thought. I'm not sure if that helps, but its something that I found works for me