It says that the questions got easier, but I feel like they actually got harder...

This question got me because it felt like B didn't address the GROWTH of skin cancer incidents, only explaining why there would still be skin cancer despite sunscreen. I guess that's why the question says most weakens and not destroys.

I have gotten nearly every level 5 NA question correct and nearly every level 4 NA question incorrect. Is there some huge difference between these two levels? Anyone else feel like level 5 is easier than level 4?

I went with A, but it didn't feel right because instead of feeling like an assumption, it felt like the conclusion. Turns out, it was pretty much just a restatement of the conclusion...which means that the conclusion is kind of an assumption? That doesn't make this confusing at all...